Step 1: Understand hormone functions.
Pituitary and related hormones regulate reproduction, growth, and pigmentation in humans.
Step 2: Analyze LTH (Prolactin).
LTH (luteotropic hormone/prolactin) helps in maintaining pregnancy and milk secretion. Hence A → 3.
Step 3: Analyze FSH.
FSH regulates spermatogenesis in males and follicle development in females. Hence B → 1.
Step 4: Analyze IGFs.
Insulin-like Growth Factors (IGFs) are responsible for bone and tissue growth, including elongation of bones. Hence C → 2.
Step 5: Analyze MSH.
Melanocyte Stimulating Hormone regulates pigmentation of skin. Hence D → 4.
Step 6: Conclusion.
Thus correct matching is A–3, B–1, C–2, D–4.