What should be the value of BMI to be considered as “Lethal” in men?

**Core Concept**
The question is about the **Body Mass Index (BMI)**, a key indicator of body fatness, and its correlation with health risks. BMI is calculated as weight in kilograms divided by the square of height in meters. A very high BMI is associated with increased risk of various health problems.

**Why the Correct Answer is Right**
A BMI of 40 or higher is often considered **class III obesity** or **severe obesity**, which significantly increases the risk of mortality. However, a BMI of 50 or higher is sometimes referred to as **"lethal"** or **"super obesity"** due to the extremely high risk of life-threatening conditions such as heart disease, stroke, and diabetes.

**Why Each Wrong Option is Incorrect**
**Option A:** A BMI of 30 is considered the threshold for obesity but is not typically labeled as "lethal".
**Option B:** A BMI of 35 is classified as class II obesity, which is severe but not usually termed "lethal".
**Option C:** A BMI of 45, while indicating severe obesity, is not the specific threshold commonly used to denote a "lethal" level.

**Clinical Pearl / High-Yield Fact**
Remember, the World Health Organization defines the following BMI categories: underweight (<18.5), normal weight (18.5-24.9), overweight (25-29.9), and obese (≥30). The obese category is further divided into class I (30-34.9), class II (35-39.9), and class III (≥40). **Correct Answer:** D. 50