Correct option is D
Explanation-
Filariasis is a parasitic disease caused by thread-like nematode worms (filarial worms). These worms are transmitted to humans by mosquito bites. The two main causative agents of lymphatic filariasis in humans are:
1. Wuchereria bancrofti
2. Brugia malayi
Therefore, Brugia malayi is indeed a causative agent of filariasis.
Incorrect options -
Option a – Listeria monocytogenes
It is a bacterium. It causes listeriosis, a serious infection from contaminated food and not related to filariasis.
Option b – Cryptococcus neoformans
It is a fungus. It causes cryptococcosis, mainly affecting the lungs and central nervous system. It is common in immunocompromised individuals and not linked to filariasis.
Option c – Francisella tularensis
It is a bacterium. It causes tularemia (also known as rabbit fever). It is transmitted through insect bites or contact with infected animals. Again, not a cause of filariasis.
So, the correct answer is option d - Brugia malayi
