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: Medicine
Average incubation period of AIDS is: March 2011 
Select and explain. 
A. 1 year, B. 3 years, C. 5 years, D. 10 years
D: 10 years
Answer: D: 10 years 
Explanation: Ans. D : 10 years The median interval from infection to the development of symptoms is around 7-10 years, although subgroups of patients exhibit 'fast' or 'slow' rates of progression.