Among the following sets , which contains only antacids .

Options

A. Cimetidine , prontosil , valium
B. Rantidine , omeprezole , lansoperazole
C. Lansoperazole, cimetidine, cetrizine
D. Cetrizine,phenelzine, paracetamol

Answer

To determine which set contains only antacids, we need to analyze the options provided and identify the substances that function as antacids. Antacids are substances that neutralize stomach acidity and are commonly used to relieve heartburn and indigestion.

### Step-by-Step Solution:

1. **Understand the Definition of Antacids**:
- Antacids are substances that neutralize stomach acid. They are typically used to relieve symptoms of heartburn, indigestion, and upset stomach.

2. **Examine the First Set of Options**:
- **Cimetidine**: This is an acid reducer, not an antacid. It reduces acid production in the stomach.
- **Prontosil**: This is an antibacterial drug, not related to antacids.
- **Valium**: This is a tranquilizer used for anxiety and depression, not an antacid.
- **Conclusion**: None of these are antacids.

3. **Examine the Second Set of Options**:
- **Ranitidine**: This is a proton pump inhibitor that reduces stomach acid, hence it is considered an antacid.
- **Omeprazole**: This also reduces acid production, classifying it as an antacid.
- **Lansoprazole**: Similar to the others, it is used to decrease stomach acid production, making it an antacid.
- **Conclusion**: All three substances in this set are antacids.

4. **Examine the Third Set of Options**:
- **Citrizine**: This is an antihistamine used for allergies, not an antacid.
- **Phenylzine**: This is an antidepressant, not related to antacids.
- **Paracetamol**: This is an analgesic and antipyretic, used for pain and fever, not an antacid.
- **Conclusion**: None of these are antacids.

5. **Final Conclusion**:
- The only set that contains only antacids is the second set with **Ranitidine, Omeprazole, and Lansoprazole**.

### Answer:
The correct answer is **Part B** (Ranitidine, Omeprazole, Lansoprazole) as it contains only antacids.