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': 'Which of the following is main etiological factor for Hidradenitis suppurativa \nSelect and explain. \nA. Smoking, B. Diabetes, C. Steroid use, D. Obesity', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Smoking is the main etiological factor for Hidradenitis suppurativa.', 'role': 'assistant'}]