**Core Concept**
Iron supplementation in pregnancy is crucial to prevent and treat iron deficiency anemia. The recommended dosage of iron in pregnant women varies according to their gestational age and individual needs.

**Why the Correct Answer is Right**
The Indian government recommends the use of Iron and Folic Acid (IFA) tablets for all pregnant women. The IFA tablet contains a specific amount of iron to meet the increased demand during pregnancy. The recommended content of iron in IFA tablets is 100 mg of ferrous sulfate, which is equivalent to 60 mg of elemental iron per day. This dosage is essential to prevent and treat iron deficiency anemia, which is a common complication of pregnancy.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because the content of iron in IFA tablets is not 50 mg.
* **Option B:** This option is incorrect because the content of iron in IFA tablets is not 150 mg.
* **Option C:** This option is incorrect because the content of iron in IFA tablets is not 200 mg.

**Clinical Pearl / High-Yield Fact**
It is essential to note that the iron content in IFA tablets can vary slightly depending on the manufacturer and the country. However, the recommended dosage of 100 mg of ferrous sulfate or 60 mg of elemental iron per day is a standard guideline for all pregnant women.

**Correct Answer:** C. 100 mg