Assertion : Curdling is required in the manufacture of cheese.
Reason : Lactic acid bacteria are used for the purpose.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
C. If assertion is true but reason is false.
D. If both assertion and reason are false.

Answer

To solve the assertion-reason question, we will analyze both statements step by step.

### Step 1: Understand the Assertion
**Assertion:** Curdling is required in the manufacture of cheese.

- Curdling is a crucial process in cheese production. It involves the coagulation of milk proteins, which is essential for forming the solid structure of cheese. Without curdling, cheese cannot be produced.

**Hint:** Think about the processes involved in cheese making and the role of curdling.

### Step 2: Understand the Reason
**Reason:** Lactic acid bacteria are used for the purpose.

- Lactic acid bacteria play a vital role in the curdling process. They ferment lactose (milk sugar) into lactic acid, which helps in coagulating the milk proteins. This is a key step in the cheese-making process.

**Hint:** Consider how lactic acid bacteria contribute to the curdling process.

### Step 3: Analyze the Relationship
- Both the assertion and the reason are true. Curdling is indeed required for cheese production, and lactic acid bacteria are used to facilitate this process.
- However, while the reason explains the role of lactic acid bacteria, it does not fully explain why curdling is necessary in cheese production. Curdling is a broader process that involves more than just the action of lactic acid bacteria.

**Hint:** Reflect on whether the reason directly explains the necessity of the assertion.

### Step 4: Conclusion
- Since both statements are true, but the reason does not serve as the correct explanation for the assertion, we conclude that the correct answer is:
**Both assertion and reason are true, but the reason is not the correct explanation of the assertion.**

**Final Answer:** Option 2 - Both assertion and reason are true, but the reason is not the correct explanation of the assertion.