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: Dental
A female comes with froathy, green vaginal discharge of 5 days duration. There was "strawberry cervix" on examination. Drug of choice for the infection is: 
Select and explain. 
A. Metronidazole, B. Tetracycline, C. Fluconazole, D. Ciprofloxacin
A: Metronidazole
Answer: A: Metronidazole 
Explanation: Above symptoms are suggestive of infection by Trichomonas.vaginalis, which is treated by  T.Metronidazole 2g stat (or T.Secnidazole 2g stat)