Which is the correct statement about birth control pills?

Options

A. Contain estrogen only
B. Contain progesterone only.
C. Contain a mixture of estrogen and progesterone derivatives
D. Progesterone enhances ovulation.

Answer

### Step-by-Step Solution:

1. **Understanding Birth Control Pills**: Birth control pills are medications taken by women to prevent pregnancy. They are commonly used as a form of contraception.

2. **Composition of Birth Control Pills**: Birth control pills typically contain a combination of hormones, primarily estrogen and progesterone (or its derivatives). This mixture is crucial for their contraceptive effect.

3. **Mechanism of Action**: The hormones in birth control pills work in several ways:
- They prevent ovulation, which means that eggs are not released from the ovaries.
- They thicken the cervical mucus, making it more difficult for sperm to enter the uterus.
- They alter the lining of the uterus, making it less suitable for a fertilized egg to implant.

4. **Evaluating Statements**: When assessing statements about birth control pills, it is important to identify whether they accurately describe the composition and function of these pills.
- A correct statement would mention that birth control pills contain a mixture of estrogen and progesterone.
- Incorrect statements might suggest that they contain only one of these hormones or misrepresent their function.

5. **Conclusion**: Based on the information, the correct statement about birth control pills is that they contain a mixture of estrogen and progesterone derivatives, which work together to prevent ovulation and create an environment that is not conducive to fertilization.