Match column I with column II and select the correct answer from the gives codes.
`{:(Column I,Column II),(A."Trichoderma",(i)"Free living nitrogen fixing bacteria"),(B."Streptomyces",(ii)"Biocontrol agent"),(C."Azospirillum",(iii)"Lactic acid"),(D."Lactobacillus",(iv)"Source of antibiotic"):}`

Options

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

Answer

To solve the matching question between Column I and Column II, we will identify the correct matches for each item in Column I based on their functions or characteristics listed in Column II.

### Step-by-Step Solution:

1. **Identify Trichoderma (A)**:
- Trichoderma is a type of fungus known primarily for its role as a **biocontrol agent** against other fungal pathogens in plants.
- **Match**: A → (ii) Biocontrol agent.

2. **Identify Streptomyces (B)**:
- Streptomyces are a group of bacteria that are an important source of **antibiotics**. They produce a variety of antibiotics, including streptomycin and neomycin.
- **Match**: B → (iv) Source of antibiotic.

3. **Identify Azospirillum (C)**:
- Azospirillum is a genus of bacteria that is known for being **free-living nitrogen-fixing bacteria**. They help in nitrogen fixation, which is beneficial for plant growth.
- **Match**: C → (i) Free living nitrogen fixing bacteria.

4. **Identify Lactobacillus (D)**:
- Lactobacillus is a type of bacteria that plays a crucial role in the production of **lactic acid**, which is important in fermentation processes.
- **Match**: D → (iii) Lactic acid.

### Final Matches:
- A → (ii) Biocontrol agent
- B → (iv) Source of antibiotic
- C → (i) Free living nitrogen fixing bacteria
- D → (iii) Lactic acid

### Summary of Matches:
- A: Trichoderma → (ii) Biocontrol agent
- B: Streptomyces → (iv) Source of antibiotic
- C: Azospirillum → (i) Free living nitrogen fixing bacteria
- D: Lactobacillus → (iii) Lactic acid

### Correct Code:
The correct answer code based on the matches is:
- A → (ii), B → (iv), C → (i), D → (iii)