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: Dental
"Snail track ulcers" are seen in 
Select and explain. 
A. Primary syphilis, B. Secondary syphilis, C. Tertiary syphilis, D. Latent syphilis
B: Secondary syphilis
Answer: B: Secondary syphilis 
Explanation: None