## **Core Concept**
The waist-hip ratio (WHR) is a measure used to assess body fat distribution and is calculated by dividing the waist circumference by the hip circumference. It is an indicator of health risks associated with central obesity. The WHR varies between genders.

## **Why the Correct Answer is Right**
A normal or healthy waist-hip ratio for women is generally considered to be below 0.85. This is because women typically have a pear-shaped body distribution, with more fat stored in the hips and thighs compared to men, who tend to store fat centrally. A WHR of 0.85 or less indicates that a woman has a lower risk of health problems associated with central obesity, such as diabetes, cardiovascular disease, and metabolic syndrome.

## **Why Each Wrong Option is Incorrect**
- **Option A:** 0.75 is indeed below the threshold but might be considered too low for a general guideline, as it doesn't reflect the commonly used cutoff.
- **Option B:** 0.80 is below 0.85 but still within a range that could be considered normal; however, it's not the best answer given the more commonly used threshold.
- **Option C:** 0.90 is above the generally accepted threshold of 0.85 for women, indicating a higher risk of health problems associated with central obesity.
- **Option D:** Not provided, but based on the correct answer, any value above 0.85 would be considered incorrect.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that while the waist-hip ratio is a useful indicator of health risks, the absolute values of waist and hip circumference, as well as BMI, are also important. For women, a waist circumference greater than 88 cm (34.6 inches) is often used as a cutoff for increased risk.

## **Correct Answer:** D. 0.85