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: Skin
[{'content': 'Causative factor for acne are following except \nSelect and explain. \nA. Androgen, B. Only food, C. Keratin, D. Cell nucleus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B. i.e. Only food', 'role': 'assistant'}]