In human beings, where does the complete digestion of carbohydrates, proteins and fats take place?

Correct option is C

The correct answer is (C) Small intestine.

Explanation:
The complete digestion of carbohydrates, proteins, and fats occurs in the small intestine.

Other options explanations:

• Stomach: Partial digestion of proteins only.
• Rectum: Not involved in digestion.
• Large intestine: Involved in water and salt absorption, not digestion.

Information booster:

• Small intestine:
  • Enzymes: Amylase (carbohydrates), Pepsin (proteins), Lipase (fats).
  • Structure: Includes duodenum, jejunum, ileum.
  • Absorption of nutrients occurs here.