**Core Concept:**
The question is asking about the measurement of height and weight, which are important anthropometric parameters used in medical diagnosis and treatment planning. Correlation between height and weight is essential to determine body mass index (BMI), which is a measure of body fat based on height and weight.

**Why the Correct Answer is Right:**
The correct answer is the Body Mass Index (BMI) formula, which is calculated as weight in kilograms divided by height in meters squared (kg/m²). BMI is widely used to classify an individual's weight status, distinguishing between underweight, normal weight, overweight, and obesity. It is a simple, non-invasive method for determining an individual's body composition.

**Why Each Wrong Option is Incorrect:**
A. Body Mass (BM) is not a valid measure for determining body fat. BMI takes into account both weight and height, whereas BM only considers weight.
B. Lean Body Mass (LBM) is the total body mass excluding fat mass. While LBM is important for assessing muscle mass and overall health, it is not a reliable indicator of body fat percentage.
C. Body Surface Area (BSA) is a measure of the total surface area of the body, primarily used in drug dosage calculations. It does not relate to body fat percentage.
D. Fat-Free Mass (FFM) is the total body mass excluding fat mass. Similar to LBM, FFM is important for assessing muscle mass but is not a reliable indicator of body fat percentage.

**Clinical Pearl / High-Yield Fact:**
In medical practice, BMI is a valuable tool for assessing body fat percentage and determining an individual's weight status. However, it has its limitations, as it does not differentiate between muscle, bone, and fat mass. Therefore, it is essential to combine BMI with other clinical information (e.g., waist circumference) to obtain a more accurate assessment of body composition and overall health status.