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: Pharmacology
Metronidazole is a type of: 
Select and explain. 
A. Broad spectrum antibiotic, B. Quinolone, C. Imidazole derivative, D. Antidepressant
C: Imidazole derivative
Answer: C: Imidazole derivative 
Explanation: None