This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Central Nervous System, Subject name: Pediatrics
[{'content': 'MacEwen sign is seen in: \nSelect and explain. \nA. Hydrocephalus, B. Encephalitis, C. Meningitis, D. Microcephaly', 'role': 'user'}, {'content': "Answer: A \nExplanation: a. Hydrocephalus(Ref: Nelson's 20/e p 2814, Ghai 8/e p 574)In Hydrocephalus, percussion of the skull might produce a cracked pot sound or MacEwen sign, indicating separation of the sutures.", 'role': 'assistant'}]