Oral contraceptive pills help in birth control by:

Correct option is B

Correct Answer: (b)
Explanation:
Oral contraceptive pills contain estrogen and progesterone, or progesterone alone, which inhibit the secretion of FSH and LH from the pituitary gland, thus preventing ovulation.
Information Booster:
FSH stimulates follicle growth; LH triggers ovulation.
High hormone levels from pills provide negative feedback to stop LH surge.
The ovum is not released, so fertilization cannot occur.
Pills also thicken cervical mucus, making sperm entry difficult.
Examples: Mala-D, Saheli, Ovral — safe, reversible hormonal contraceptives.
Additional Information (Incorrect Options):
(a) Pills do not destroy ova — they prevent release.
(c) Barrier methods (like condoms, diaphragms) form a physical barrier, not pills.
(d) Spermicidal gels or foams kill sperm, not hormonal pills.