Sour taste is perceived on the tongue at

Options

A. Tip
B. Sides
C. Upper surface of front half
D. Back.

Answer

**Step-by-Step Solution:**

1. **Identify the Question**: The question asks where sour taste is perceived on the tongue.

2. **Understand the Function of the Tongue**: The tongue is a sensory organ that detects different tastes. It has specific regions that are sensitive to different taste modalities.

3. **List the Types of Tastes**: The four primary tastes that the tongue can perceive are sweet, salty, sour, and bitter.

4. **Locate the Sour Taste**: Among these tastes, sour taste is specifically perceived at the sides of the tongue.

5. **Eliminate Incorrect Options**:
- The tip of the tongue is primarily sensitive to sweet and salty tastes.
- The upper surface of the front half is not primarily associated with sour taste.
- The back of the tongue is more sensitive to bitter taste.

6. **Conclude the Answer**: Therefore, the correct answer is that sour taste is perceived on the tongue at the sides.

**Final Answer**: Sour taste is perceived on the tongue at the sides.

---