Antacids include

Options

A. Omeprazole
B. Lansoprazole
C. Sodium bicarbonate
D. All of these

Answer

To determine which substances are classified as antacids, we need to analyze the options provided:

1. **Understanding Antacids**: Antacids are substances that help neutralize stomach acid (hydrochloric acid, HCl). They are commonly used to relieve heartburn, indigestion, and upset stomach.

2. **Analyzing the Options**:
- **Option A: Omeprazole**: This is a proton pump inhibitor (PPI) that reduces the production of stomach acid. While it is used to treat conditions related to excess stomach acid, it is not classified as a traditional antacid.
- **Option B: Lansoprazole**: Similar to omeprazole, lansoprazole is also a proton pump inhibitor and works by decreasing the amount of acid the stomach produces. It is not a conventional antacid.
- **Option C: Sodium Bicarbonate**: This is a basic compound that can neutralize stomach acid. It is commonly used as an antacid to relieve symptoms of acid indigestion and heartburn.
- **Option D: All of these**: This option suggests that all the substances listed are antacids.

3. **Conclusion**:
- While omeprazole and lansoprazole are effective in managing acid-related conditions, they do not act as antacids in the traditional sense. Sodium bicarbonate, on the other hand, is a classic antacid. Therefore, the correct answer is not "all of these" since omeprazole and lansoprazole are not traditional antacids.

Thus, the correct answer is **C: Sodium Bicarbonate**.