This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
[{'content': 'True statement about hydrocephalus is \nSelect and explain. \nA. Macewen sign seen, B. Sun rise sign of eyes is seen, C. Most common cause is Dandy - waler malformation, D. All of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Hydrocephalus\n\nMost common cause is Aqueductal stenosis\nMacewen sign is cracked pot sound produced on percussion of skull in raised intracranical tension.\n\t"Sun set" sign of eyes seen.', 'role': 'assistant'}]