Name diagnostic test which confirms typhoid.

Explanation

### Step-by-Step Solution:

1. **Understanding Typhoid**: Typhoid is a disease caused by the bacterium *Salmonella typhi*.

2. **Identifying the Diagnostic Test**: The primary diagnostic test used to confirm typhoid fever is called the **Widal test**.

3. **Sample Collection**: To perform the Widal test, a sample must be collected from the patient. This sample can be taken from:
- Blood
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