Assertion : Filarial worm is transmitted to humans by Culex mosquito. Reason : Culex prefers to breed in fresh water.

Step-by-step solution

Wuchereria (W.bancrofti & W.malayi), the filarial worms cause a slowly developing chronic inflammation of the organs in which they live for many years, usually the lymphatic vessels of the lower limbs, and the disease is called filariasis. The pathogen spread from one human being to another through mosquitoes like Culex and to a less extent by Anopheles and Aedes. The parasite resides in lymph vessels, connective tissues and mesentery. It is manifestated by lymphoedema accompanied by thickening of subcutaneous tiss