Assertion: Tobacco smoking is the main cause of lung cancer.
Reason: Tobacco smoke has a carcinogen called nicotine.

Options

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

Answer

To solve the assertion-reason question, we will analyze both the assertion and the reason provided.

### Step 1: Analyze the Assertion
The assertion states that "Tobacco smoking is the main cause of lung cancer."
- Tobacco smoking is indeed a significant risk factor for lung cancer. Numerous studies have shown a strong correlation between tobacco use and the incidence of lung cancer. Therefore, the assertion is **true**.

### Step 2: Analyze the Reason
The reason states that "Tobacco smoke has a carcinogen called nicotine."
- While nicotine is a well-known component of tobacco, it is important to note that nicotine itself is not classified as a carcinogen. Instead, it is the other chemicals present in tobacco smoke, such as benzopyrene and nitrosamines, that are primarily responsible for its carcinogenic effects. However, the statement that tobacco smoke contains carcinogens is correct, but it is misleading to label nicotine as the primary carcinogen. Therefore, the reason is **partially true** but not entirely accurate.

### Step 3: Determine the Relationship
Now we need to determine the relationship between the assertion and the reason.
- Since the assertion is true and the reason is partially true but does not correctly explain the assertion (as it misidentifies nicotine as the main carcinogen), the correct conclusion is that both statements are true, but the reason does not provide the correct explanation for the assertion.

### Final Conclusion
The correct answer to the question is that both the assertion and the reason are true, but the reason is not the correct explanation for the assertion.