This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Adverse Drug Effect, Subject name: Pharmacology
[{'content': 'Flushing occurs following alcohol ingestion in patients taking:(1995) \nSelect and explain. \nA. Metronidazole, B. Penicillin, C. Tetracycline, D. Chloramphenicol', 'role': 'user'}, {'content': 'Answer: A \nExplanation: aRef: KDT, 5,h ed, p. 351 -354 & 4lh ed. p. 364, 361', 'role': 'assistant'}]