Match Column 1 with Column 2:

A-i, B-iii, C-iv, D-ii

The correct answer is Option (4) - A-i, B-iii, C-iv, D-ii

A. Sporozoites - i. Infectious form of Plasmodium

Plasmodium enters the human body as sporozoites (infectious form) through the bite of infected female Anopheles mosquito. The parasites initially multiply within the liver cells and then attack the red blood cells (RBCs) resulting in their rupture.

B. Filariasis - iii. Wuchereria

Elephantiasis or filariasis is a disease caused by the helminth worm, Wuchereria bancrofti. The worms invade and live for many years in the lymphatic vessels of the limbs, leading to chronic inflammation and swelling of the limbs. The genital organs might also be infected, resulting in major deformities.

C. Typhoid - iv. Widal test

Salmonella typhi is a pathogenic bacterium which causes typhoid fever in human beings. These pathogens generally enter the small intestine through food and water contaminated with them and migrate to other organs through blood. Typhoid fever could be confirmed by Widal test .

D. Chikungunya - ii. Aedes mosquitoes

Dengue and chikungunya are primarily spread by the bite of female mosquitoes belonging to the Aedes genus. These mosquitoes are known as the primary vectors for these viral diseases.