**Question:** Absolute contraindication of hormone replacement therapy is:

A. Ovarian cancer
B. Breast cancer
C. Congenital adrenal hyperplasia
D. Active uncontrolled liver disease

**Core Concept:** Hormone replacement therapy (HRT) is a therapy that aims to replace the deficient hormones in the body. In the context of this question, we are discussing HRT for treating menopausal symptoms and preventing postmenopausal osteoporosis. Absolute contraindications are situations where administering HRT is extremely risky and can lead to severe adverse effects.

**Why the Correct Answer is Right:**

D. Active uncontrolled liver disease is the correct answer because:

- Liver disease impairs the liver's ability to detoxify estrogen, making HRT potentially toxic and causing further liver damage.
- Patients with uncontrolled liver disease are at high risk of developing liver failure or other complications from HRT.

**Why Each Wrong Option is Incorrect:**

A. Ovarian cancer: While ovarian cancer is a risk factor for HRT, it is not the absolute contraindication. Ovarian cancer patients can be considered for HRT in a case-by-case basis, with careful monitoring and surveillance.

B. Breast cancer: Patients with a history of breast cancer are generally advised against HRT. However, absolute contraindication typically refers to patients with active or uncontrolled disease, which is not explicitly mentioned here.

C. Congenital adrenal hyperplasia: This is a genetic disorder affecting adrenal hormone production and is unrelated to HRT contraindications.

**Clinical Pearl:**

When assessing whether a patient is suitable for HRT, consider the patient's individual factors, including age, duration of menopause, presence of severe vasomotor symptoms, and other risk factors. Hormonal therapy can be a valuable tool in managing menopausal symptoms, but careful evaluation and monitoring are essential to minimize potential risks and complications.