The hardest constituent of the tooth is-

Correct Answer: A

Rationale: Enamel is the hardest substance in the human body, protecting the tooth's inner layers.

Correct Answer: C

Rationale: The liver is the largest gland in the human body, performing numerous metabolic functions.

Correct Answer: A

Rationale: Amylase breaks down starch into maltose, a disaccharide.

Correct Answer: C

Rationale: The small intestine is the primary site for nutrient absorption due to its large surface area.

Correct Answer: B

Rationale: Pancreatic juice is secreted by acinar cells, and hormones by Islets of Langerhans.