Purpose of giving betamethasone to preterm labor patient?

Correct option is A

Betamethasone is a corticosteroid administered to mothers in preterm labor to stimulate surfactant production in fetal lungs, reducing risk of respiratory distress syndrome. Explanation of options:
· (a) ✔ Main purpose of prenatal steroid therapy.
· (b) ✘ Tocolytics are used to delay labor, not steroids.
· (c) ✘ Not the function of corticosteroids.
· (d) ✘ Ductus arteriosus closure is unrelated.