An enzyme which helps in the digestion of protein is

The correct answer is (d) protease.

Protease is an enzyme that helps in the digestion of protein. It breaks down proteins into smaller peptides and amino acids, which can then be absorbed by the body.

Urease is an enzyme that breaks down urea into ammonia and carbon dioxide.

Sulfatase is an enzyme that breaks down sulfates into sulfate ions.

Trypsin is an enzyme that breaks down proteins into peptides.

Protease is the only enzyme listed that helps in the digestion of protein.