Pick the odd one out with respect to respiratory system of human beings.
Nostrills, Gills, Lungs, Alveoli

Explanation

To solve the question of identifying the odd one out with respect to the respiratory system of human beings, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Options**: The options given are Nostrils, Gills, Lungs, and Alveoli.

2. **Understand the Function of Each Option**:
- **Nostrils**: These are external openings that allow air to enter the respiratory system. They are part of the human respiratory system.
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