Which among the following chemicals is used under chemical methods for contraception ?

Options

A. Lactic acid
B. Citric acid
C. Boric acid
D. All of these.

Explanation

To solve the question "Which among the following chemicals is used under chemical methods for contraception?", we can follow these steps:

### Step-by-Step Solution:

1. **Understand Contraception**:
- Contraception refers to methods that prevent pregnancy during sexual intercourse. The goal is to prevent sperm from meeting the egg.

2. **Identify Chemical Methods**:
- Chemical methods of contraception primarily involve the use of spermicides, which are substances that kill sperm or inhibit their movement.

3. **Examine the Options**:
- The options given are:
- A) Lactic Acid
- B) Citric Acid
- C) Boric Acid
- D) All of these

4. **Define Spermicides**:
- Spermicides are chemicals that are used to kill sperm. Common spermicides include lactic acid and citric acid, which can be used alone or in combination.

5. **Evaluate Each Option**:
- **Lactic Acid**: Known to be a spermicide.
- **Citric Acid**: Also recognized as a spermicide.
- **Boric Acid**: Can be used as a spermicide as well.
- Since all three chemicals have applications in contraception, we need to consider the combination of these options.

6. **Conclusion**:
- Since lactic acid, citric acid, and boric acid can all be used as spermicides, the correct answer is option D) All of these.

### Final Answer:
**D) All of these**