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
Not true about measles 
Select and explain. 
A. Carriers are the source of infection, B. Koplik spots are pathognomonic, C. Edmonston zagreb strain used for vaccine, D. Incubation period is 2 weeks
A: Carriers are the source of infection
Answer: A: Carriers are the source of infection 
Explanation: None