Identify the part which vibrates to produce soud in following instruments.
Dholak
Sitar
Flute.

Explanation

To identify the parts that vibrate to produce sound in the specified instruments, we will analyze each instrument one by one.

### Step-by-Step Solution:

1. **Dholak**:
- The Dholak is a percussion instrument that has two membranes (or drum heads) stretched over its ends.
- When you hit these membranes, they vibrate.
- **Answer**: The part that vibrates in the Dholak is the **thin membrane** (or stretched membrane).
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