Match the column :-
`{:(,X["Colloids"],,,,Y["Classification"],),(I,Dust,,,A,Gel,),(II,"Cheese",,,B,Aerosol,),(III,"Soap lather",,,C,"Emulsion",),(IV,Milk,,,D,Foam,):}`

Options

A. `{:(I,II,III,IV,),(A,B,C,D,):}`
B. `{:(I,II,III,IV,),(A,C,B,D,):}`
C. `{:(I,II,III,IV,),(B,A,D,C,):}`
D. `{:(I,II,III,IV,),(B,A,C,D,):}`

Answer

To solve the matching question, we need to identify the correct classification of colloids based on the given examples in column X and match them with the appropriate classifications in column Y.

### Step-by-Step Solution:

1. **Identify the Colloids in Column X:**
- Dust
- Cheese
- Soap lather
- Milk

2. **Understand the Classifications in Column Y:**
- Gel (A)
- Aerosol (B)
- Emulsion (C)
- Foam (D)

3. **Classify Each Colloid:**
- **Dust:** Dust consists of small solid particles dispersed in air (gas). This matches the classification of **Aerosol (B)**.
- **Cheese:** Cheese is a solid where liquid is dispersed within it. This matches the classification of **Gel (A)**.
- **Soap Lather:** Soap lather is formed when gas is dispersed in a liquid, which corresponds to the classification of **Foam (D)**.
- **Milk:** Milk is a mixture of fat droplets dispersed in water, which corresponds to the classification of **Emulsion (C)**.

4. **Match the Colloids with Their Classifications:**
- Dust → Aerosol (B)
- Cheese → Gel (A)
- Soap lather → Foam (D)
- Milk → Emulsion (C)

5. **Final Matching:**
- I → B (Dust → Aerosol)
- II → A (Cheese → Gel)
- III → D (Soap lather → Foam)
- IV → C (Milk → Emulsion)

### Summary of Matches:
- I (Dust) → B (Aerosol)
- II (Cheese) → A (Gel)
- III (Soap lather) → D (Foam)
- IV (Milk) → C (Emulsion)

### Final Answer:
- I - B
- II - A
- III - D
- IV - C