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: Microbiology
Penile ulcer is painful in: 
Select and explain. 
A. Syphilis, B. LGV, C. Donovanosis, D. Chancroid
D: Chancroid
Answer: D: Chancroid 
Explanation: Ans. is. 'd' i. e., Chancroid