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: Pathology
Splitted papule at corner of mouth 
Select and explain. 
A. Recurrent herpes labialis, B. Recurrent herpetic stomatitis, C. Increased vertical dimension, D. Secondary syphilis
D: Secondary syphilis
Answer: D: Secondary syphilis 
Explanation: None