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: Pathology
[{'content': 'Lichenoid reactions are mainly due to: \nSelect and explain. \nA. Intake of certain drugs, B. Betel nut chewing, C. Cigarette smoking, D. Intake of alcohol', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Lichenoid reactions are drug induced and exhibit histopathological features similar to lichen planus. The common drugs implicated in oral Lichenoid reactions are — antihypertensives, NSAIDS, pencillamine followed by dapsone, ketocanazole, streptomycin, sulfamethoxazole, tetracycline, chloroquine, and oral hypoglycemic agents, etc.\nDrug induced lichenoid reactions may resolve promptly when the offending drug is eliminated. Disease exhibiting lichenoid reactions include lichen pLanus, erythema multiformae, secondary syphilis and lupus erythematosus', 'role': 'assistant'}]