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
Causative organism of which STD has safety pin appearance: 
Select and explain. 
A. LGV, B. Chancroid, C. Syphilis, D. Herpes genitalis
C: Syphilis
Answer: C: Syphilis 
Explanation: Ans. is. 'c' i. e., Chancroid