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: Unknown
[{'content': 'All of the following fluoroquinolones have been withdrawn except – \nSelect and explain. \nA. Trovafloxacin, B. Gatifloxacin, C. Gemifloxacin, D. Grepafloxacin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Gemifloxacin. All others have been withdrawn.\nTrovafloxacin due to hepatotoxicity\nGatifloxacin due to hypo/hyper glycemia\nGrepafloxacin due to adverse cardiac events', 'role': 'assistant'}]