From the following relationship between respiration volumes and capacities, mark the correct option.
(i) Inspiratory Capacity (IC) `=` Tidal Volume + Residual Volume
(ii) Vital Capacity (VC) = Tidal Volume (TV) + Inspiratory Reserve Volume (IRV) + Expiratory Reserve Volume (ERV)
(iii) Residual Volume (RV) = Vital Capacity (VC) - Inspiratory Reserve Volume (IRV)
(iv) Tidal Volume (TV) = Inspiratory Capacity (IC) - Inspiratory Reserve Volume (IRV)

Options

A. (i) Incorrect, (ii) Incorrect, (iii) Incorrect, (iv) Correct
B. (i) Incorrect, (ii) Correct, (iii) Incorrect, (iv) Correct
C. (i) Correct, (ii) Correct, (iii) Incorrect, (iv) Correct
D. (i) Correct, (ii) Incorrect, (iii) Correct, (iv) Incorrect

Answer

To solve the question regarding the relationships between respiration volumes and capacities, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement (i): Inspiratory Capacity (IC) = Tidal Volume (TV) + Residual Volume (RV)**
- **Analysis**: Inspiratory Capacity (IC) is defined as the maximum amount of air that can be inhaled after a normal expiration. It is calculated as the sum of Tidal Volume (TV) and Inspiratory Reserve Volume (IRV), not Residual Volume (RV). Therefore, this statement is **false**.

2. **Statement (ii): Vital Capacity (VC) = Tidal Volume (TV) + Inspiratory Reserve Volume (IRV) + Expiratory Reserve Volume (ERV)**
- **Analysis**: Vital Capacity (VC) is indeed the maximum amount of air that can be exhaled after a maximum inhalation. It is calculated by adding Tidal Volume (TV), Inspiratory Reserve Volume (IRV), and Expiratory Reserve Volume (ERV). Thus, this statement is **true**.

3. **Statement (iii): Residual Volume (RV) = Vital Capacity (VC) - Inspiratory Reserve Volume (IRV)**
- **Analysis**: Residual Volume (RV) is the volume of air remaining in the lungs after a forced expiration. The correct relationship is RV = VC - (TV + IRV + ERV). Therefore, this statement is also **false**.

4. **Statement (iv): Tidal Volume (TV) = Inspiratory Capacity (IC) - Inspiratory Reserve Volume (IRV)**
- **Analysis**: Tidal Volume (TV) is the amount of air inhaled or exhaled during normal breathing. Inspiratory Capacity (IC) is the sum of TV and IRV. Rearranging this gives us TV = IC - IRV, which makes this statement **true**.

### Conclusion:
- The correct statements are (ii) and (iv). However, since the question asks for the correct option, the most relevant and clear correct statement is **(ii)**.

### Final Answer:
The correct option is **(ii)**: Vital Capacity (VC) = Tidal Volume (TV) + Inspiratory Reserve Volume (IRV) + Expiratory Reserve Volume (ERV).

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