This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chemotherapy, Subject name: Pharmacology
Drug of choice for bacterial vaginosis is: 
Select and explain. 
A. Metronidazole, B. Ampicillin, C. Ciprofloxacin, D. Fluconazole
A: Metronidazole
Answer: A: Metronidazole 
Explanation: Trichomonas vaginitis :It is the drug of choice; 400 mg TDS for 7 days achieves nearly 100% cure. Additional intravaginal treatment has been given, but is not necessary except in refractory cases. The male paner should be treated concurrently in cases of recurrent infections. Nonspecific bacterial vaginosis also respondst is the drug of choice; 400 mg TDS for 7 days achieves nearly 100% cure. Additional intravaginal treatment has been given, but is not necessary except in refractory cases. The male paner should be treated concurrently in cases of recurrent infections. Nonspecific bacterial vaginosis also responds ESSENTIALS OF MEDICAL PHARMACOLOGY page no.838