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
Incubation period of syphilis - 
Select and explain. 
A. 1 hour - 5 hour, B. 24 hour - 48 hour, C. 1 days - 10 days, D. 10 days - 90 days
D: 10 days - 90 days
Answer: D: 10 days - 90 days 
Explanation: None