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 hydrocoele in infants is \nSelect and explain. \nA. Patent gubernaculum, B. Patent processus vaginalis, C. Cyst of morgagni, D. Harmonal factors', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]