**Question:** High crural index is seen in

A. Obesity
B. Malabsorption
C. Chronic kidney disease
D. Diabetes mellitus

**Core Concept:** The crural index, also known as the abdominal circumference index, is a measure used in clinical practice to assess body fat distribution and its association with cardiovascular risk factors. It is calculated as the ratio of the waist circumference to the hip circumference (W/H ratio). High crural index indicates increased abdominal obesity, which is associated with an increased risk of developing non-communicable diseases like diabetes and cardiovascular diseases.

**Why the Correct Answer is Right:** A high crural index is associated with obesity (Option A), which is characterized by an increased fat mass distribution, including abdominal fat accumulation. This type of obesity is linked to an increased risk of cardiovascular diseases and type 2 diabetes mellitus due to the release of pro-inflammatory cytokines, insulin resistance, and dyslipidemia.

**Why Each Wrong Option is Incorrect:**

- Malabsorption (Option B) typically results from conditions like celiac disease or short bowel syndrome, leading to malnutrition and not an increased abdominal obesity.
- Chronic kidney disease (Option C) is associated with muscle wasting, anemia, and fluid overload, not with an increased abdominal obesity.
- Diabetes mellitus (Option D) is primarily characterized by hyperglycemia and insulin resistance but not by a high crural index. However, a high crural index is a risk factor for developing type 2 diabetes mellitus.

**Why Option A is Right:** Obesity, specifically abdominal obesity, is associated with a high crural index. It results in an increased risk of developing non-communicable diseases like cardiovascular diseases and type 2 diabetes mellitus due to the release of pro-inflammatory cytokines, insulin resistance, and dyslipidemia.

**Clinical Pearl:** Monitoring patients' crural index can help identify those at an increased risk for non-communicable diseases, enabling early intervention and lifestyle modifications to reduce the risk. A healthy W/H ratio is generally considered below 0.9 for males and below 0.85 for females.