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: Social & Preventive Medicine
All of the following are used as proxy measures for incubation period, except 
Select and explain. 
A. Latent period, B. Generation time, C. Serial interval, D. Period of communicability
D: Period of communicability
Answer: D: Period of communicability 
Explanation: None