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
All of the following fluoroquinolones have been withdrawn except – 
Select and explain. 
A. Trovafloxacin, B. Gatifloxacin, C. Gemifloxacin, D. Grepafloxacin
C: Gemifloxacin
Answer: C: Gemifloxacin 
Explanation: Gemifloxacin. All others have been withdrawn.
Trovafloxacin due to hepatotoxicity
Gatifloxacin due to hypo/hyper glycemia
Grepafloxacin due to adverse cardiac events