Match the items in Column I with its main use listed in Column II:
`{:(" Column I"," Column II"),("(A) Silica gel","(i) Transistor"),("(B) Silicon","(ii) Ion-exchanger"),("(C) Silicone","(iii) Drying agent"),("(D) Silicate","(iv) Sealant"):}`

Options

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

Explanation

To solve the matching question between Column I and Column II, we will analyze each item in Column I and identify its main use from Column II.

### Step-by-Step Solution:

1. **Identify the use of Silica Gel (A)**:
- Silica gel is primarily used as a drying agent because it has the ability to absorb moisture from the air.
- **Match**: (A) Silica gel → (iii) Drying agent

2. **Identify the use of Silicon (B)**:
- Silicon is a semiconductor material commonly used in the manufacturing of electronic components, particularly transistors.
- **Match**: (B) Silicon → (i) Transistor

3. **Identify the use of Silicone (C)**:
- Silicone is often used as a sealant due to its flexibility and resistance to moisture and temperature changes.
- **Match**: (C) Silicone → (iv) Sealant

4. **Identify the use of Silicate (D)**:
- Silicates are used in ion-exchange processes, particularly in water purification and softening.
- **Match**: (D) Silicate → (ii) Ion-exchanger

### Final Matches:
- (A) Silica gel → (iii) Drying agent
- (B) Silicon → (i) Transistor
- (C) Silicone → (iv) Sealant
- (D) Silicate → (ii) Ion-exchanger

### Summary of Matches:
- (A) → (iii)
- (B) → (i)
- (C) → (iv)
- (D) → (ii)