Which of the following is responsible for sleeping sickness?

1. Leishmania
2. Mycobacterium
3. Rhizobium
4. Trypanosoma

Correct Answer: (d) Trypanosoma

Explanation:

 Trypanosoma is responsible for sleeping sickness.

Trypanosoma belongs to a group of flagellated protozoa that exist as obligatory parasites of plants, mammals, and other animals (fish, birds, reptiles, etc) with a life cycle that most often involves two hosts, an insect vector and a mammalian host.