The leading cause of infectious disease mortality in India is:

Correct option is B

Despite progress, tuberculosis remains the top infectious killer in India, contributing to significant morbidity and mortality every year.
Explanation of options: (a) ✘ Malaria causes seasonal deaths but far fewer than TB. (b) ✔ Correct; TB is the leading cause of infectious mortality in India. (c) ✘ HIV causes chronic illness but TB deaths are higher. (d) ✘ Diarrheal diseases are major in children but TB still leads overall.