## **Core Concept**
Centchroman, also known as ormeloxifene, is a selective estrogen receptor modulator (SERM) used primarily for the treatment of dysfunctional uterine bleeding and as a contraceptive. It acts by modulating estrogen receptors in the uterus and pituitary gland.

## **Why the Correct Answer is Right**
The correct dosage of centchroman for its contraceptive and therapeutic effects is crucial. Centchroman is administered orally, and its dosage is specified in milligrams. The standard weekly dose of centchroman is **30 mg**, which is essential for its efficacy in preventing pregnancy and managing menstrual disorders.

## **Why Each Wrong Option is Incorrect**
- **Option A:** 10 mg - This dose is lower than the standard recommended dose for centchroman, which might not provide the desired therapeutic or contraceptive effect.
- **Option B:** 20 mg - Although closer, this is still not the standard dose used for centchroman therapy.
- **Option D:** 60 mg - This dose is higher than the recommended standard dose and could potentially increase the risk of side effects without providing additional benefits.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that centchroman must be taken once a week, on the same day each week, to maintain its contraceptive efficacy. It takes about 3 months for centchroman to start acting as a contraceptive, and it is not recommended for emergency contraception.

## **Correct Answer:** . 30 mg