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
Flushing occurs following alcohol ingestion in patients taking:(1995) 
Select and explain. 
A. Metronidazole, B. Penicillin, C. Tetracycline, D. Chloramphenicol
A: Metronidazole
Answer: A: Metronidazole 
Explanation: aRef: KDT, 5,h ed, p. 351 -354 & 4lh ed. p. 364, 361