Which of the following contraceptive methods correctly matches with its mode of action ?

Options

A. `{:("Contraceptive method Mode of action"),(" Tubectomy Make the uterus unstable for implantation"):}`
B. `{:("Contraceptive method Mode of action"),(" Oral pills Inhibit ovulation and implantation"):}`
C. `{:("Contraceptive method Mode of action"),(" Diaphragms Spermicidal and increases phagocytosis of sperms within the uterus"):}`
D. `{:("Contraceptive method Mode of action"),(" IUDs Blocks gamete transport"):}`

Answer

To solve the question regarding which contraceptive method correctly matches with its mode of action, we can analyze each method and its corresponding mechanism:

### Step-by-Step Solution:

1. **Understand the Contraceptive Methods**:
- The methods mentioned are tubectomy, oral pills, diaphragms, and IUDs.

2. **Analyze Tubectomy**:
- **Mode of Action**: Tubectomy involves cutting and tying the fallopian tubes. This prevents the ovum from reaching the uterus, thereby preventing fertilization and implantation.
- **Conclusion**: Tubectomy does not make the uterus inhospitable; it prevents the passage of the ovum.

3. **Analyze Oral Pills**:
- **Mode of Action**: Oral contraceptive pills typically contain a combination of estrogen and progesterone. These hormones inhibit ovulation, meaning that no egg is released for fertilization.
- **Conclusion**: Oral pills primarily prevent ovulation, and they may also affect the uterine lining to prevent implantation.

4. **Analyze Diaphragms**:
- **Mode of Action**: Diaphragms are barrier methods that cover the cervix, preventing sperm from entering the uterus.
- **Conclusion**: Diaphragms do not have a spermicidal effect; they simply block sperm from reaching the uterus.

5. **Analyze IUDs (Intrauterine Devices)**:
- **Mode of Action**: IUDs are inserted into the uterus and create an environment that is inhospitable for implantation. They do not block gamete transfer but prevent fertilized eggs from implanting.
- **Conclusion**: IUDs make the uterus inhospitable for implantation.

6. **Match Each Method with Its Mode of Action**:
- Tubectomy: Blocks gamete transfer (correct)
- Oral Pills: Inhibit ovulation (correct)
- Diaphragms: Prevent sperm from reaching the uterus (correct)
- IUDs: Make the uterus inhospitable for implantation (correct)

7. **Final Answer**: The correct match is **B**: Oral Pills inhibit ovulation and implantation.