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: Anaesthesia
[{'content': 'Causative factor for acne are all except. \nSelect and explain. \nA. Androgen, B. Only food, C. Bacterial contamination, D. Hypercornification of duct', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Only food', 'role': 'assistant'}]