## Core Concept
The question pertains to the iron content of a specific type of iron supplement, MALA-D. This requires knowledge of various iron supplements and their compositions.

## Why the Correct Answer is Right
MALA-D is a type of iron supplement that contains **ferrous sulfate** and **folic acid**. The iron content in such supplements can vary, but MALA-D specifically is known to contain a certain amount of elemental iron per tablet.

## Why Each Wrong Option is Incorrect
- **Option A:** This option is incorrect because it does not accurately represent the iron content of MALA-D.
- **Option B:** This option is incorrect because it also does not accurately represent the iron content of MALA-D.
- **Option D:** This option is incorrect because it does not match the known iron content of MALA-D.

## Clinical Pearl / High-Yield Fact
A key point to remember is that different iron supplements have varying amounts of elemental iron, which is crucial for determining their efficacy and potential side effects. MALA-D, being a specific formulation, contains **100 mg of elemental iron**.

## Correct Answer: C. 100 mg.