Intrinsic factor is essential for the absorption of vitamin:

Options

A. `B_(12)`
B. `B_(2)`
C. `B_(3)`
D. `B_(7)`

Answer

To solve the question regarding which vitamin requires intrinsic factor for absorption, we can follow these steps:

### Step 1: Understand the Role of Intrinsic Factor
Intrinsic factor is a glycoprotein produced by the parietal cells of the stomach. Its primary role is to bind to vitamin B12 (cobalamin) and facilitate its absorption in the intestines.

### Step 2: Identify the Vitamins
The question mentions several B vitamins, including B7, B3, B2, and B12. We need to focus on their absorption mechanisms.

### Step 3: Analyze Each Vitamin
- **Vitamin B7 (Biotin)**: Involved in metabolism but does not require intrinsic factor for absorption.
- **Vitamin B3 (Niacin)**: Converts food into glucose and does not require intrinsic factor.
- **Vitamin B2 (Riboflavin)**: Involved in energy production and does not require intrinsic factor.
- **Vitamin B12 (Cobalamin)**: Requires intrinsic factor for its absorption in the ileum of the small intestine.

### Step 4: Conclusion
Based on the analysis, the only vitamin that requires intrinsic factor for absorption is **Vitamin B12**.

### Final Answer
The correct answer is **Vitamin B12**.

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