Progesterone or progestogen-oestrogen combination injections and implants are used by the female under the:

Options

A. skin of inner arm above elbow
B. vagina
C. stomach's upper skin
D. cervix

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the use of progesterone or progestogen-oestrogen combination injections and implants by females. It's important to identify the context in which these methods are used.

2. **Identifying the Purpose**: Progesterone and oestrogen combination injections and implants are primarily used for birth control. They help in regulating hormonal secretions to prevent unwanted pregnancies.

3. **Location of Administration**: These hormonal injections and implants are typically administered in the upper arm, specifically on the inner side above the elbow. This is a common site for hormonal implants.

4. **Mechanism of Action**: The hormonal combination works by altering the hormonal balance in the body, which prevents ovulation and thus avoids pregnancy. This method is considered a chemical method of contraception.

5. **Conclusion**: Based on the information provided, the correct answer to the question is that progesterone or progestogen-oestrogen combination injections and implants are used by females under the category of hormonal birth control methods.