Correct option is A
Malaria is not caused by bacteria; it is caused by a parasite called Plasmodium, transmitted through the bites of infected Anopheles mosquitoes. On the other hand, Typhoid, Diphtheria, and Tetanus are all caused by bacteria:
Typhoid is caused by Salmonella typhi, primarily spread through contaminated food and water.
Diphtheria is caused by Corynebacterium diphtheriae, which affects the throat and airways.
Tetanus is caused by Clostridium tetani, which enters the body through wounds and affects the nervous system. Thus, malaria, being parasitic in origin, is the correct answer.
