**Core Concept**
The World Health Organization (WHO) has established a set of clinical criteria for the diagnosis of AIDS, particularly in resource-limited settings where laboratory facilities may not be available. These criteria include a combination of major and minor signs. The major signs are critical for diagnosing AIDS as they reflect the severe immunocompromised state of the patient.

**Why the Correct Answer is Right**
The correct answer includes chronic diarrhea > 1 month, chronic fever > 1 month, and weight loss of at least 10% of body weight. These symptoms are indicative of a severely compromised immune system, which is characteristic of AIDS. Chronic diarrhea and fever can result from opportunistic infections that take advantage of the weakened immune state, while significant weight loss is a marker of severe disease.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not include all the major signs required for the diagnosis.
**Option B:** This option is also incomplete as it lacks key symptoms like weight loss.
**Option C:** Similarly, this option is incorrect as it does not encompass the full spectrum of major signs.

**Clinical Pearl / High-Yield Fact**
It's crucial to remember that the diagnosis of AIDS involves a combination of clinical findings and laboratory confirmation, where possible. The presence of one or more of these major signs, in conjunction with minor signs and a history suggestive of HIV exposure, can lead to a diagnosis of AIDS in the appropriate clinical context.

**Correct Answer:** D. Chronic diarrhea > 1 month, Chronic fever > 1 month, Weight loss of at least 10% of body weight