In human digestive system, the enzymes pepsin and trypsin are secreted respectively by:(a) pancreas and liver (b) stomach and salivary glands (c) pancreas and gall bladder (d) stomach and pancreas

Correct Answer: (d) Stomach and pancreas

Explanation: Pepsin, secreted by the stomach, is an enzyme that breaks down proteins into smaller amino acids. Trypsin, released by the pancreas, breaks down proteins.