This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Misc., Subject name: Microbiology
Painful vaginal ulcer with inguinal lymphadenopathy and school of fish appearance of microorganism on microscopy are characteristic of - 
Select and explain. 
A. Syphilis, B. LGV, C. Granuloma inguinale, D. Chancroid
D: Chancroid
Answer: D: Chancroid 
Explanation: Ans. is 'd' i.e., Chancroid