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
A 30 year old male, Kallu, with a history of sexual exposure comes with a painless indurated ulcer over the penis with everted margins. The diagnosis is - 
Select and explain. 
A. Syphilis, B. Chancroid, C. Lymphogranuloma venereum, D. Granuloma inguinale
A: Syphilis
Answer: A: Syphilis 
Explanation: None