## Core Concept
The recommended daily requirement of vitamin A varies among individuals based on factors such as age, sex, and physiological state, including pregnancy. Vitamin A is crucial for vision, immune function, reproduction, and cellular communication, as well as for the proper functioning of the heart, lungs, kidneys, and other organs.

## Why the Correct Answer is Right
Pregnant women have an increased requirement for vitamin A due to its role in fetal development, including the development of the eyes, immune system, and skin. The recommended dietary allowance (RDA) for vitamin A during pregnancy is higher to support these increased needs. The RDA for pregnant women is **800-900 μg/day** of retinol activity equivalents (RAE), which is higher than for non-pregnant women.

## Why Each Wrong Option is Incorrect
* **Option A:** This option is incorrect because it does not specify a value within the known recommended range for pregnant women.
* **Option B:** Similarly, this option does not provide a correct or recognizable value for the daily recommended intake of vitamin A for pregnant women.
* **Option D:** This option suggests a value that is not aligned with established nutritional guidelines for vitamin A intake during pregnancy.

## Clinical Pearl / High-Yield Fact
A key point to remember is that while vitamin A is essential, excessive intake can be harmful. Pregnant women should avoid high doses of vitamin A supplements, as excessive intake can lead to teratogenic effects. The goal is to meet but not exceed the recommended daily intake.

## Correct Answer: C. 800-900 μg/day.