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
A female patient presents with reddish vagina and greenish discharge, the probable diagnosis is : 
Select and explain. 
A. Herpes infection, B. Trichomonas vagination, C. Gonococcal infection, D. Candidiasis
B: Trichomonas vagination
Answer: B: Trichomonas vagination 
Explanation: Trichomonas vagination