Correct option is A
Ans. (a) Mumps
Sol.
Mumps is a viral disease caused by the mumps virus. It is contagious even before symptoms appear, particularly in the 2 days before the onset of swelling and up to 5 days after. The virus spreads through respiratory droplets and direct contact with saliva.
Explanation of each option:
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(a) Mumps –
Correct answer. Mumps can infect others before symptoms like swelling of the salivary glands become evident.
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(b) Typhoid –
Incorrect. Typhoid is primarily spread through contaminated food and water, and transmission mainly occurs from symptomatic carriers.
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(c) Malaria –
Incorrect. Malaria is transmitted through mosquito bites and does not spread directly from person to person before symptom onset.
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(d) Tuberculosis –
Incorrect. TB is an airborne disease, but it is usually contagious only when symptoms like persistent cough develop.