Choice A rationale Persistent cough is generally associated with respiratory conditions like asthma or congestive heart failure rather than primary renal pathology. In acute poststreptococcal glomerulonephritis, the underlying mechanism involves immune complex deposition in the glomerular basement membrane. This leads to inflammatory changes within the kidneys but does not typically trigger a primary pulmonary cough reflex unless the patient develops significant secondary pulmonary edema from severe fluid volume overload. Choice B rationale Peripheral edema occurs due to a significant decrease in the glomerular filtration rate and subsequent sodium and water retention. The normal glomerular filtration rate is typically ≥ 90 mL/min/1.73m. In this condition, the kidneys are unable to effectively excrete excess fluid, leading to expansion of the extracellular fluid volume. This often manifests as periorbital edema in the morning and progresses to peripheral edema in the extremities during the day. Choice C rationale Dry, itchy skin is more characteristic of chronic kidney disease and end-stage renal disease where uremic frost and high phosphorus levels irritate the skin. Acute poststreptococcal glomerulonephritis is an acute inflammatory process occurring about 10 to 21 days after a streptococcal infection. While skin lesions like impetigo may have preceded the renal symptoms, the acute glomerulonephritis phase itself does not typically present with generalized pruritus or chronic dryness. Choice D rationale Hematuria is a hallmark sign caused by the inflammation of the glomerular capillaries, which allows red blood cells to leak into the urine. This often results in a characteristic smoky or cola-colored appearance of the urine. Microscopically, the presence of red blood cell casts confirms that the bleeding is originating from the glomeruli. The irritation and damage to the filtration barrier are direct consequences of the post-infectious immune response. Choice E rationale Elevated blood pressure, or hypertension, results from the decreased excretion of sodium and water and the possible activation of the renin-angiotensin-aldosterone system. Normal blood pressure is typically < 120/80 mmHg. In acute poststreptococcal glomerulonephritis, the intravascular volume expansion leads to increased cardiac output and systemic vascular resistance. Monitoring blood pressure is critical during the acute phase to prevent complications such as hypertensive encephalopathy or acute heart failure. Choice F rationale A recent history of a group A beta-hemolytic streptococcal infection, such as strep throat or impetigo, is the essential precursor for this condition. The body produces antibodies against the bacteria, which then form immune complexes that become trapped in the glomerular loops. This triggers an inflammatory cascade and complement activation. Confirming a previous infection through history or elevated antistreptolysin O titers is fundamental for diagnosing this specific type of glomerulonephritis.