Intrinsic factor is produced in

Options

A. Production of gastric juice
B. Absorption of `B_(12)`
C. Peristalsis
D. Feeling of hunger

Answer

**Step-by-Step Text Solution:**

1. **Understanding Intrinsic Factor**: Intrinsic factor is a glycoprotein essential for the absorption of vitamin B12 in the intestines. It binds to vitamin B12 and facilitates its absorption in the ileum (the last part of the small intestine).

2. **Identifying the Source**: Intrinsic factor is produced by the parietal cells located in the gastric mucosa (the lining of the stomach).

3. **Analyzing the Options**:
- **Option A: Production of gastric juice**: While parietal cells do contribute to gastric juice production, intrinsic factor specifically is not directly related to the production of gastric juice.
- **Option B: Absorption of B12**: This is the primary function of intrinsic factor, as it is crucial for the absorption of vitamin B12.
- **Option C: Peristalsis**: This refers to the wave-like muscle contractions that move food through the digestive tract, and is not related to intrinsic factor.
- **Option D: Feeling of hunger**: This is regulated by different hormones and signals in the body, not by intrinsic factor.

4. **Conclusion**: Based on the analysis, the correct answer is **Option B: absorption of B12**. Intrinsic factor is vital for the absorption of vitamin B12 in the intestines.