Which substance is made of protein
a. testosterone
b. cholesterol
c. hemoglobin
d. polysaccharide

C. Hemoglobin

Explanation:

The hemoglobin proteins make blood red.

Its structure contains 4 protein chains, two alpha chains and two beta chains. This is used to carry oxygen through bloodstream from the lungs into the many tissues in the body.

The hemoglobin needs to be in certain levels since it is essential to survival mechanisms.

The  hemoglobin  is present in tasks involving cells structure, function and regulation of tissues and organs.

The proteins that make up hemoglobin result from smaller blocs called amino acids, the amino acids get together in chains in different arrays.

For hemoglophin this means   four protein chains, two alpha chains and two beta chains.