Which is not correct?

Options

A. (a) Hormonal injections contain projestin a hormone, similar to progesterone
B. (b) permanent methods of birth control are vesectomy and tubectomy
C. (c) i-pill, pill-72 and unwanted-72 are morning after pills
D. (d) a spermicide is less effective when used together with a barrier method of birth control

Answer

To determine which statement is not correct, we will analyze each option one by one.

### Step-by-Step Solution:

1. **Analyze Statement A**:
- Statement: "Hormonal injections contain progestin, a hormone similar to progesterone."
- Explanation: Progestin is indeed a synthetic form of progesterone and is used in hormonal injections for various contraceptive methods.
- Conclusion: This statement is **true**.

2. **Analyze Statement B**:
- Statement: "Permanent methods of birth control are vasectomy and tubectomy."
- Explanation: Vasectomy is a surgical procedure for males that involves cutting and tying the vas deferens to prevent sperm from entering the semen. Tubectomy is the female equivalent, involving cutting and tying the fallopian tubes.
- Conclusion: This statement is **true**.

3. **Analyze Statement C**:
- Statement: "I pill, pill 72, and Unwanted 72 are morning after pills."
- Explanation: These are indeed emergency contraceptive pills that contain levonorgestrel, which is effective in preventing pregnancy if taken within 72 hours after unprotected intercourse.
- Conclusion: This statement is **true**.

4. **Analyze Statement D**:
- Statement: "A spermicide is less effective when used together with a barrier of birth control."
- Explanation: This statement is incorrect. Spermicide is designed to kill sperm, and when used in conjunction with barrier methods (like condoms or diaphragms), it enhances the effectiveness of preventing pregnancy.
- Conclusion: This statement is **false**.

### Final Answer:
The incorrect statement is **D**: "A spermicide is less effective when used together with a barrier of birth control."

---