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
Disease higly transmitted during incubation period is -a)  Pertussisb)  Cholerac)  Measlesd)  Brucellosise)  Chickenpox 
Select and explain. 
A. cb, B. bad, C. ace, D. da
C: ace
Answer: C: ace 
Explanation: None