This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Mycobacterial Infections, Subject name: Dental
[{'content': 'Erythema nodosum can be seen with: \nSelect and explain. \nA. OC pills, B. Barbiturates, C. ACE inhibitors, D. Sulfonylureas', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Etiology of erythema nodosum Infections: e.g., Streptococcal, Fungal, Mycobacterial, Yersinial. Drugs: e.g., Sulfas, Penicillins, Oral contraceptives. Sarcoidosis Idiopathic causes', 'role': 'assistant'}]