Name the device which is used to protect a tall building from lightning.

Options

A. Lightening conductor
B. Lightening modem
C. Lightening tank
D. None of the above

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the name of a device that protects tall buildings from lightning strikes.

2. **Identifying the Device**: The device used for this purpose is known as a "Lightning Conductor."

3. **Description of the Lightning Conductor**:
- It is a **metallic rod** that is specifically designed to be taller than the building it protects.
- The rod is installed on the walls of the building during its construction.

4. **Function of the Lightning Conductor**: The primary function of the lightning conductor is to provide a safe pathway for lightning to follow, directing the electrical discharge safely into the ground and preventing damage to the building.

5. **Final Answer**: Thus, the answer to the question is: The device used to protect a tall building from lightning is called a **Lightning Conductor**.