Oxyntic cells secrete
(a) HCI
(b) NaOH
(c) pepsin
(d) trypsin

Options

A. HCI
B. NaOH
C. pepsin
D. trypsin

Explanation

**Step-by-Step Solution:**

1. **Identify Oxyntic Cells**: Oxyntic cells are also known as parietal cells. They are specialized epithelial cells found in the gastric glands of the stomach.

2. **Function of Oxyntic Cells**: The primary function of oxyntic (parietal) cells is to secrete hydrochloric acid (HCl) and intrinsic factor. Hydrochloric acid plays a crucial role in digestion by creating an acidic environment in the stomach, which helps in the breakdown of food and activates digestive enzymes.

3. **Evaluate the Options**:
- (a) HCl: This is a substance that oxyntic cells secrete.
- (b) NaOH: This is not secreted by oxyntic cells; it is a base and not involved in gastric secretion.
- (c) Pepsin: This is an enzyme involved in digestion, but it is secreted by chief cells, not oxyntic cells.
- (d) Trypsin: This is another digestive enzyme, but it is produced in the pancreas and not by oxyntic cells.

4. **Conclusion**: Based on the functions of oxyntic cells, the correct answer is (a) HCl.

**Final Answer**: Oxyntic cells secrete (a) HCl.

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