This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
Serial interval is a measure of? 
Select and explain. 
A. Sensitivity, B. Specificity, C. Incubation period, D. Positive predictive value
C: Incubation period
Answer: C: Incubation period 
Explanation: Ans. (c) Incubation periodRef: Park textbook 22nd ed 196