Leprosy is caused by—

Correct option is A

Sol. Leprosy (also known as Hansen's disease) is a chronic infectious disease caused by Mycobacterium leprae. It primarily affects the skin, peripheral nerves, eyes, and nasal mucosa. Transmission occurs through prolonged close contact and respiratory droplets. Early diagnosis and multidrug therapy (MDT) can prevent disability and halt transmission.
Explanation of each option:
· (a) Mycobacterium leprae – Correct Answer. An acid-fast bacillus that grows slowly and is primarily neurotropic. It cannot be cultured in artificial media and causes skin patches with sensory loss.
· (b) Mycobacterium tuberculosis – Responsible for tuberculosis, especially affecting lungs. Though related to M. leprae, it does not cause leprosy.
· (c) Rotavirus – A virus that causes diarrhea, especially in infants and young children. It affects the intestinal lining and is unrelated to leprosy.
· (d) Mosquito – A vector for diseases like malaria, dengue, and chikungunya. Leprosy is not vector-borne and has no mosquito involvement.