Which instrument is employed to hear the heart sounds?

Explanation

To answer the question "Which instrument is employed to hear the heart sounds?", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Heart Sounds**:
- The heart produces sounds known as "lub" and "dub". The "lub" sound is the first heart sound (S1) and the "dub" sound is the second heart sound (S2).

2. **Identifying the Instrument**:
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