Which of the following organisms is responsible for sleeping sickness?

Protozoa

The correct answer is Option (2) - Protozoa

• Explanation:
• Sleeping sickness, also known as African trypanosomiasis, is caused by protozoan parasites belonging to the genus Trypanosoma. The specific species responsible for the disease are Trypanosoma brucei gambiense and Trypanosoma brucei rhodesiense. These parasites are transmitted to humans through the bite of infected tsetse flies (genus Glossina). Sleeping sickness is characterized by neurological symptoms and disruptions in sleep patterns. Algae, bacteria, and viruses are not associated with sleeping sickness; it is a disease caused specifically by protozoan parasites.