<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 27-year-old woman seeks evaluation by her general physician with complaints of an odorous yellow vaginal discharge and vaginal irritation for the past 3 days. She also complains of itching and soreness. The medical history is unremarkable. She is not diabetic. She has been sexually active with a single partner for the last 3 years. A vaginal swab is sent to the lab for microscopic evaluation, the results of which are shown in the exhibit, and the culture yields heavy growth of protozoa. A pregnancy test was negative. What is the most appropriate treatment for this patient?? A: Metronidazole, B: Nystatin, C: Ampicillin, D: Fluconazole, E: Acyclovir,  <response>: This is a clinical case about a 27-year-old woman with symptoms of vaginal discharge, irritation, itching and soreness. Based on the description, this is likely a case of vaginitis. The vaginal swab results show motile protozoa, which indicates Trichomoniasis, a sexually transmitted infection caused by the parasite Trichomonas vaginalis. The treatment options given include antibiotics like Metronidazole, Ampicillin, antifungals like Nystatin, Fluconazole, and the antiviral Acyclovir. Since this is a protozoal infection, the antibiotic Metronidazole would be the most appropriate treatment. Nystatin is used for fungal infections, Ampicillin for bacterial infections, Fluconazole for yeast infections, and Acyclovir for viral infections like herpes.A: Metronidazole 