Concept:Some indigenous West African cattle breeds naturally resist trypanosomiasis.
Explanation:Trypanosomiasis is a disease caused by trypanosome parasites spread by tsetse flies.
It is also known as sleeping sickness in livestock.
The N'Dama breed is an indigenous West African taurine cattle breed.
It possesses a natural genetic tolerance to trypanosomiasis.
This allows it to survive and remain productive in tsetse-infested areas.
The White Fulani and Sokoto Gudali are Zebu breeds.
Zebu breeds generally show lower tolerance to trypanosomiasis.
The Friesian is an exotic dairy breed originating from Europe.
It is not adapted to West African conditions and lacks this tolerance.
Therefore, among the given options, the N'Dama is the breed known for trypanotolerance.
Answer:C. N'Dama