## Core Concept
The normal weight gain during pregnancy varies based on the pre-pregnancy body mass index (BMI) and is crucial for maternal and fetal health. The Institute of Medicine (IOM) provides guidelines for weight gain during pregnancy.

## Why the Correct Answer is Right
The correct answer, , is based on the recommendations from the Institute of Medicine (IOM), which suggest that for women with a normal pre-pregnancy BMI (18.5-24.9), the recommended weight gain during pregnancy is approximately 11-16 kg (24-35 lbs). This range supports optimal outcomes for both mother and baby.

## Why Each Wrong Option is Incorrect
* **Option A:** This option suggests a weight gain that is too low for a typical pregnancy, potentially leading to inadequate fetal growth and maternal health issues.
* **Option B:** Although closer, this still falls short of the recommended range for many women, especially those with a normal pre-pregnancy BMI.
* **Option D:** This option indicates a weight gain that is significantly higher than recommended for most pregnant women, increasing the risk of gestational diabetes, hypertension, and complications during delivery.

## Clinical Pearl / High-Yield Fact
A key point to remember is that the recommended weight gain during pregnancy is based on the pre-pregnancy BMI. For example, women with a normal BMI (18.5-24.9) should aim for a weight gain of 11-16 kg. This information is critical for prenatal care and can significantly impact pregnancy outcomes.

## Correct Answer: .