This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Infectious Disease Epidemiology, Subject name: Social & Preventive Medicine
True about carriers - 
Select and explain. 
A. Infection with clinical symptoms, B. Serves as source of infection, C. More infectious than cases, D. Less dangerous than cases
B: Serves as source of infection
Answer: B: Serves as source of infection 
Explanation: Ans. is 'b' i.e., Serves as source of infection o A carrier is defined as 41an infected person or animal that harbours a specific infectious agent in the absence of clinical disease and serves as a potential source of infection ".o As a rule carriers are less infectious than cases, but epidemiologically they are more dangerous than cases because they escape recognition, and continuing as they do to live a normal life among the population or comunity, they readily infect the susceptible individuals over a wider area and longer period of time.