**Core Concept**
HIV transmission occurs through various routes, including sexual contact, blood transfusions, and mother-to-child transmission. The virus attacks the body's immune system, specifically targeting **CD4 cells**. Understanding the modes of transmission is crucial for prevention and counselling.

**Why the Correct Answer is Right**
The correct answer is related to the statement that is false about HIV transmission. Since the options are not provided, let's discuss a general concept. HIV transmission can occur through unprotected sexual intercourse, sharing of needles, and from mother to child during pregnancy, childbirth, or breastfeeding. The virus is primarily transmitted through **bodily fluids**, such as blood, semen, vaginal fluids, and breast milk.

**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific statement, it's challenging to provide a detailed explanation. However, if an option states that HIV can be transmitted through casual contact, such as shaking hands or sharing food, it would be incorrect.
**Option B:** Similarly, if an option claims that HIV can be transmitted through mosquito bites, it would be incorrect, as HIV is not transmitted by insects.
**Option C:** If an option states that HIV can only be transmitted through sexual contact, it would be incorrect, as transmission can also occur through blood transfusions and mother-to-child transmission.
**Option D:** Without the specific statement, it's difficult to provide a detailed explanation.

**Clinical Pearl / High-Yield Fact**
A crucial point to remember is that HIV transmission can be prevented through the use of **antiretroviral therapy**, **pre-exposure prophylaxis**, and **post-exposure prophylaxis**. Counselling and education on safe sex practices and needle exchange programs are also essential in preventing HIV transmission.

**Correct Answer:**

✓ Correct Answer: A. The risk of acquiring HIV with unprotected receptive anal intercourse is lower than that with penile-vaginal intercourse