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: Gynaecology & Obstetrics
Greenish vaginal discharge with severe itching points to a diagnosis of: 
Select and explain. 
A. Candidiasis, B. Senile vaginitis, C. Trichomoniasis, D. Pyogenic vaginitis
C: Trichomoniasis
Answer: C: Trichomoniasis 
Explanation: Patients infected with Trichomonas vaginalis presents with pruritus, dysuria, dyspareunia, or abdominal pain. Vaginal examination in these patients copious frothy, yellow or greenish discharge. There is also inflammation of vaginal wall and cervix with punctate hemorrhages. Wet mount examination of the discharge shows motile organisms. Rapid antigen and nucleic acid amplification tests are highly specific and much more sensitive than wet mounts. Metronidazole or tinidazole is the treatment of choice. Ref: Rosenthal P.J. (2013). Chapter 35. Protozoal & Helminthic Infections. In M.A. Papadakis, S.J. McPhee, M.W. Rabow, T.G. Berger (Eds), CURRENT Medical Diagnosis & Treatment 2014.