This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Polycystic Kidney Disease, Subject name: Pathology
[{'content': 'Gross morphology of kidney (cut surface) is shown below. What is your likely diagnosis? \nSelect and explain. \nA. Autosomal dominant polycystic kidney disease (ADPKD), B. Autosomal recessive polycystic kidney disease (ARPKD), C. Multicystic renal dysplasia, D. Medullary sponge kidney', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Autosomal dominant polycystic kidney disease (ADPKD) Gross appearance, the kidneys are bilaterally enlarged and may achieve enormous sizes; weights as much as 4 kg each. External surface - composed of a mass of cysts, up to 3 to 4 cm in diameter, with no intervening parenchyma.', 'role': 'assistant'}]