What is the causative agent of COVID-19 disease?

Correct option is B

Sol. COVID-19 is caused by the SARS-CoV-2 virus, a type of coronavirus that primarily affects the respiratory system. It spreads through respiratory droplets and can cause mild to severe illness, including pneumonia and multi-organ failure in severe cases.
Explanation of each option:
· (a) Bacteria – Incorrect, as COVID-19 is not caused by bacteria. Bacterial infections can occur as secondary complications but do not cause COVID-19.
· (b) Virus – Correct answer. COVID-19 is caused by SARS-CoV-2, a virus that spreads through direct contact, respiratory droplets, and contaminated surfaces.
· (c) Fungus – Fungal infections affect the lungs, skin, and nails but are not responsible for COVID-19. However, fungal infections like mucormycosis were observed in COVID-19 patients with weakened immunity.
· (d) Protozoa – Protozoan infections, like malaria and amoebiasis, are caused by parasites, not viruses, and are unrelated to COVID-19.