## Core Concept
Centchroman, also known as ormeloxifene, is a selective estrogen receptor modulator (SERM) that has anti-estrogenic effects on the endometrium. It is primarily used for its contraceptive properties and to treat conditions like dysfunctional uterine bleeding.

## Why the Correct Answer is Right
Centchroman works by modulating estrogen receptors in different tissues, leading to its contraceptive and therapeutic effects. It prevents pregnancy by inhibiting implantation of the ovum and also has beneficial effects on menstrual bleeding patterns.

## Why Each Wrong Option is Incorrect
- **Option A:** Centchroman can be used for contraception, making it relevant here.
- **Option B:** It has applications in treating dysfunctional uterine bleeding due to its effects on the endometrium.
- **Option C:** Centchroman is indeed used for conditions related to its anti-estrogenic and pro-estrogenic effects, which might include certain gynecological conditions.

## Why Option D is Correct but not detailed above
**Option D:** is the correct choice because Centchroman is not used in **Cancer treatment or chemoprevention** directly; its primary indications do not include cancer therapy or prevention.

## Clinical Pearl / High-Yield Fact
A key point to remember is that Centchroman has a delayed onset of action and requires a loading dose, taking about 3 months to become effective as a contraceptive.

## Correct Answer: D. Cancer.