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
Causative factor for acne are following except – 
Select and explain. 
A. Androgen, B. Only food, C. Bacterial contamination, D. Hypercomification of duct
B: Only food
Answer: B: Only food 
Explanation: Role of diet is controversial; while patients often feel that certain diet exacerbate their acne, scientific proof for this for lacking.