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': 'Erythema nodosum is due to – a) Contraceptive pillsb) Barbituratesc) Penicillind) Sulphonamides \nSelect and explain. \nA. b, B. ad, C. ac, D. ab', 'role': 'user'}, {'content': "Answer: B \nExplanation: Causes of Erythema nodosum\nIdiopathic\nBacterial: - Streptococci, TB, Leprosy (ENL), LGV, yersinia, mycoplasma, Rickettsia, Cat scratch disease.\nFungal: - Coccidioidomycosis, Histoplasmosis, Trichophyton.\nViral : - HBV, HIV\nDrugs : - Sulfonamides, iodides, oral contraceptives.\nSystemic diseases : - IBD (Ulcerative colitis, Crohn's disease), Sarcoidosis, Bechet's disease, SLF\nMalignancy : - Hodgkin's disease, other malignancies\nOther : - Pregnancy", 'role': 'assistant'}]