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: Surgery
[{'content': 'Cause of hydrocele in infants ? \nSelect and explain. \nA. Patent processus vaginalis, B. Patent gubernaculum, C. Impaired drainage, D. Epididymal cyst', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Patent processus vaginalis", 'role': 'assistant'}]