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
. The following set of words can be used synonymously in epidemiology - 
Select and explain. 
A. Source and Reservoir, B. Index and primary case, C. Latent infection and subclinical infection, D. Serial interval and incubation period
C: Latent infection and subclinical infection
Answer: C: Latent infection and subclinical infection 
Explanation: None