Available choices: (I). teeth; (II). birth marks; (III). muscle; (IV). taste buds; (V). hair; (VI). wool; (VII). sugar; (VIII). fur;
Q: Fact 1: Hair is a fiber that is found only in mammals. Fact 2: All mammals are warm-blooded. Given the two facts above, what fiber can be found only in warm-blooded animals?
A:
(V).