A balloon fruit is
(a) Hopea
(b) Dipterocarpus
(c) Colutea
(d) Alstonia

Options

A. Hopea
B. Dipterocarpus
C. Colutea
D. Alstonia

Answer

To determine which of the following options represents a balloon fruit, we will analyze each option based on the characteristics of balloon fruits.

### Step-by-Step Solution:

1. **Understanding Balloon Fruits**:
- Balloon fruits are a type of inflated capsular fruit. They typically have a structure that allows them to expand and resemble a balloon.

2. **Analyzing Option (a) Hopea**:
- Hopea is not known for having balloon fruits. It does not exhibit the characteristics of an inflated capsular fruit.

3. **Analyzing Option (b) Dipterocarpus**:
- Dipterocarpus also does not produce balloon fruits. It is not classified as a balloon wine and does not have the inflated structure typical of balloon fruits.

4. **Analyzing Option (c) Colutea**:
- Colutea is recognized for having balloon fruits. It is a type of balloon wine and exhibits the characteristics of an inflated capsular fruit.

5. **Analyzing Option (d) Alstonia**:
- Alstonia does not produce balloon fruits either. It does not fit the description of an inflated capsular fruit.

6. **Conclusion**:
- The only option that correctly identifies a balloon fruit is **(c) Colutea**.

### Final Answer:
(c) Colutea