**Core Concept**
The question requires knowledge of HIV transmission routes, which involve the exchange of bodily fluids that contain the virus. HIV can be transmitted through various modes, but not all the options listed are accurate.

**Why the Correct Answer is Right**
HIV is primarily transmitted through the exchange of bodily fluids that contain the virus, including blood, semen, vaginal and rectal fluids, and breast milk. The virus is not typically transmitted through casual contact or everyday activities.

**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because sexual contact is a common mode of HIV transmission.
**Option B:** Incorrect because needle sharing or blood transfusions can also transmit HIV.
**Option C:** Incorrect because HIV can be transmitted from mother to child during pregnancy, childbirth, or breastfeeding.

**Clinical Pearl / High-Yield Fact**
HIV is not transmitted through casual contact such as hugging, shaking hands, or sharing food and drinks.

**Correct Answer:** A.