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
Painless ulcer along with painless lymphadenopathy is characteristic of which STD: 
Select and explain. 
A. Syphilis, B. Chancroid, C. LGV, D. Donovanosis
A: Syphilis
Answer: A: Syphilis 
Explanation: Ans. is. 'a' i. e., Syphilis