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
The oral Lesion of syphilis that is highly infective is a: 
Select and explain. 
A. Gumma, B. Koplik spot, C. Mucous patch, D. Tabes dorsalis
C: Mucous patch
Answer: C: Mucous patch 
Explanation: None