AIDS is mainly caused by

Options

A. Sexual intercourse
B. Blood transfusion
C. Through placental transfusion
D. All of the above

Answer

**Step-by-Step Solution:**

1. **Understanding AIDS**:
- AIDS stands for Acquired Immunodeficiency Syndrome. It is a condition that results from the infection of the Human Immunodeficiency Virus (HIV).

2. **Identifying the Cause**:
- The primary cause of AIDS is the Human Immunodeficiency Virus (HIV). This virus attacks the immune system, weakening it and making the body more susceptible to infections and diseases.

3. **Modes of Transmission**:
- AIDS can be transmitted through several means:
- **Sexual Intercourse**: Engaging in unprotected sex with an infected person can lead to the transmission of HIV.
- **Blood Transfusions**: Receiving blood from an infected donor can also transmit the virus.
- **Needle Sharing**: Using needles or syringes that have been used by an infected person can lead to blood-to-blood transmission.
- **Mother to Child**: The virus can be transmitted from an infected mother to her child during pregnancy, childbirth, or breastfeeding.

4. **Conclusion**:
- Therefore, AIDS is mainly caused by the Human Immunodeficiency Virus (HIV), which can be transmitted through various means including sexual contact, blood transfusions, needle sharing, and from mother to child.