Select the incorrect association.

Correct Answer: A

Rationale: Vasopressin is from the posterior pituitary, not adrenal medulla.

Correct Answer: B

Rationale: GH acts via somatomedins (IGF-1) to stimulate bone growth.

Correct Answer: D

Rationale: Corticotropes secrete ACTH, not cortisol directly.

Correct Answer: B

Rationale: PTH inhibits phosphate reabsorption in the PCT to increase blood Ca2+. It enhances Ca2+ reabsorption in the DCT, not PCT, and affects osteoblasts, not osteoclasts directly. Calcitonin and oestrogens inhibit osteoclasts.

Correct Answer: B

Rationale: GLUT transporters (e.g., GLUT4) facilitate glucose diffusion across membranes, not requiring energy directly.