A house or building is the safest place during a thunderstorm.

Explanation

**Step-by-Step Solution:**

1. **Understanding Thunderstorms**:
- A thunderstorm is a weather event characterized by the presence of thunder and lightning. It often brings heavy rain and strong winds.

2. **Recognizing the Risks**:
- During a thunderstorm, one of the main dangers is lightning. Lightning can strike buildings, trees, and open areas, posing a significant risk to anyone caught outside.

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