Pick the odd one out

Answer: [C] Diphtheria

Third option is the correct answer
Other three diseases are spread through mosquitoes but Diphtheria is an infection caused by the Corynebacterium diphtheriae bacterium. It is spread (transmitted) from person to person, usually through respiratory droplets, like from coughing or sneezing.

This question is a part of GKToday's Integrated IAS General Studies Module