Statement: A large number of people visiting India from country X have been tested positive for carrying viruses of a killer disease.
Courses of Action:
1. The government of India should immediately put a complete ban on people coming to India from country X including those Indians who are settled in country X.
2. The government of India should immediately set up detection centres at all its airports and seaports to identify and quarantine those who are tested positive.
Answer: B
Clearly, the non-infected persons should not be debarred from visiting India. So, only course II follows.