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: Dental
[{'content': 'Causative factor for acne are following except – \nSelect and explain. \nA. Androgen, B. Only food, C. Bacterial contamination, D. Hypercomification of duct', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Role of diet is controversial; while patients often feel that certain diet exacerbate their acne, scientific proof for this\xa0for lacking.', 'role': 'assistant'}]