## **Core Concept**
Centchroman, also known as Ormeloxifene, is a nonsteroidal oral contraceptive that functions by modulating estrogen receptors and influencing the hypothalamic-pituitary-gonadal axis. This class of medication is distinct from traditional hormonal contraceptives, which contain estrogen and progesterone.

## **Why the Correct Answer is Right**
Centchroman works by binding to estrogen receptors, thereby altering the transcription of genes involved in the reproductive cycle. This leads to a decrease in follicle-stimulating hormone (FSH) and luteinizing hormone (LH) release from the pituitary gland, ultimately resulting in anovulation and contraception. Unlike traditional hormonal contraceptives, Centchroman does not affect the menstrual cycle significantly, making it an attractive option for certain patients.

## **Why Each Wrong Option is Incorrect**
**Option A:** Fibroids are benign tumors of the uterus, and Centchroman is not indicated for their treatment. While hormonal changes can influence fibroid growth, Centchroman is not specifically used for managing fibroids.
**Option B:** Endometriosis is a condition characterized by the growth of endometrial tissue outside the uterus, leading to chronic pain and infertility. Centchroman is not a treatment for endometriosis and may even exacerbate symptoms in some cases.
**Option C:** Injectable contraceptives, such as depot medroxyprogesterone acetate (DMPA), are administered via injection every 3 months. Centchroman is an oral medication, not an injectable form of contraception.

## **Clinical Pearl / High-Yield Fact**
Centchroman is also used off-label for the treatment of precancerous cervical lesions, such as cervical dysplasia. Its unique mechanism of action makes it an interesting option for patients with certain medical conditions, such as breast cancer or thrombophilia, where traditional hormonal contraceptives may be contraindicated.

## **Correct Answer:**
✓ Correct Answer: D. Nonsteroidal oral contraception