A large quantity of one of the following is removed from our body by lungs.

Options

A. `CO_2` only
B. `H_2O` only
C. `CO_2 and H_2O`
D. Ammonia

Answer

To solve the question "A large quantity of one of the following is removed from our body by lungs," we need to analyze the options given:

1. **Understanding the Role of Lungs**:
- The primary function of the lungs is to facilitate gas exchange. They take in oxygen and expel carbon dioxide, a waste product of cellular respiration.

2. **Analyzing the Options**:
- **Option A: CO2 only**: Carbon dioxide is indeed a major waste product that is expelled from the body through the lungs in large quantities.
- **Option B: H2O only**: While water vapor is present in the air we exhale, it is not removed in large quantities compared to carbon dioxide.
- **Option C: CO2 and H2O**: Although both are expelled, carbon dioxide is the predominant waste product removed in large amounts.
- **Option D: Ammonia**: Ammonia is primarily excreted through urine by the kidneys, not the lungs.

3. **Conclusion**:
- Based on the analysis, the correct answer is **Option A: CO2 only**. The lungs remove a large quantity of carbon dioxide from the body.

### Steps Recap:
1. Identify the function of the lungs (gas exchange).
2. Evaluate each option against the function of the lungs.
3. Determine which substance is expelled in large quantities.
4. Conclude with the correct answer.