Oral contraceptive pills are taken orally to prevent unwanted pregnancies. Saheli is also an oral contraceptive pill, which is made up of a non-hormonal compound called Centchroman. It is also known as Ormeloxifene and is a selective estrogen receptor modulator (SERM). Saheli has been approved by the Indian government for contraceptive use since 1991.

Mechanism of Action:
Saheli works by preventing the fertilization of eggs and inhibiting implantation of the fertilized egg to the uterus. It does not affect the ovulation process unlike hormonal contraceptive pills.

Advantages:
• It has a non-hormonal composition which makes it suitable for women who cannot use hormonal contraceptives.
• It has a long-lasting effect, and a single dose can provide protection for up to a week.
• It does not cause any significant side-effects.
• It has been found to reduce the risk of breast cancer in women.

Disadvantages:
• Saheli does not protect against sexually transmitted infections (STIs).
• It is less effective than hormonal contraceptives in preventing pregnancy.
• It is not suitable for women who have liver diseases or blood clotting disorders.

Conclusion:
Saheli is an oral contraceptive pill that is safe and effective for preventing unwanted pregnancies. It is a non-hormonal contraceptive option suitable for women who cannot use hormonal contraceptives. However, it is important to consult a doctor before using any contraceptive method to determine the most suitable option for an individual's health and lifestyle.

Correct answer is a. Saheli is oral contraceptive for female contains a non steroidal preparation.