Among the following methods, which one has the highest failure rate ?

Options

A. Diaphragm with spermicide
B. Condom
C. Intrauterine device
D. Rhythm method

Answer

To determine which contraceptive method has the highest failure rate among the options provided, we can analyze each method step-by-step.

### Step-by-Step Solution:

1. **Identify the Methods**: The methods given are:
- Diaphragm with spermicide
- Condom
- Intrauterine device (IUD)
- Rhythm method

2. **Understand Each Method**:
- **Diaphragm with Spermicide**: This is a barrier method that prevents sperm from entering the uterus. It is generally effective but can have a failure rate if not used correctly.
- **Condom**: Another barrier method that prevents sperm from reaching the egg. It is widely used and has a relatively low failure rate when used properly.
- **Intrauterine Device (IUD)**: This device is inserted into the uterus and can be copper-based or hormonal. It creates an environment that is unsuitable for sperm, thus preventing fertilization. It has a low failure rate.
- **Rhythm Method**: This natural family planning method involves tracking the menstrual cycle to avoid intercourse during fertile days. It relies on the accuracy of tracking and can be affected by various factors.

3. **Analyze the Failure Rates**:
- The diaphragm with spermicide, condom, and IUD all have relatively low failure rates when used correctly.
- The rhythm method, however, has a higher failure rate because it depends on the accurate monitoring of the menstrual cycle, which can be influenced by various factors such as stress or health issues.

4. **Conclusion**: Based on the analysis of the methods and their effectiveness, the rhythm method has the highest failure rate among the options provided.

### Final Answer:
The method with the highest failure rate is **D. Rhythm method**.

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