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
Prognosis of a disease can be given by- 
Select and explain. 
A. Secondary attack rate, B. Incubation period, C. Latency, D. Serial interval
B: Incubation period
Answer: B: Incubation period 
Explanation: None