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: Ans. is 'c' i.e., Latent infection and subclinical infection Though none of the given pairs can be used as synonymously, the best answer is 'c'.