Read the following statements about cancer . Identify the true and false ones and select the correct option .
A . Cancer cells lose the property of contact inhibition
B. The property of metastasis is mostly found in benign tumors .
C. The transformation of normal cells into cancerous cells occurs only because of chemical agents.
D. The chemical carcinogen present in tobacco smoke is a major cause of lung cancer.

Options

A. A - True , B - False , C - False , D - True
B. A - False , B - True , C - True , D - False
C. A - True , B - False , C - True , D - False
D. A - False , B - True , C - False , D - True

Answer

To solve the question regarding the statements about cancer, we will analyze each statement one by one to determine whether they are true or false.

### Step-by-Step Solution:

1. **Statement A: Cancer cells lose the property of contact inhibition.**
- **Analysis:** Contact inhibition is a property of normal cells that prevents them from dividing uncontrollably when they come into contact with each other. Cancer cells do lose this property, leading to uncontrolled growth.
- **Conclusion:** This statement is **True**.

2. **Statement B: The property of metastasis is mostly found in benign tumors.**
- **Analysis:** Metastasis refers to the spread of cancer cells from the original site to other parts of the body. This property is characteristic of malignant tumors, not benign tumors, which remain localized and do not spread.
- **Conclusion:** This statement is **False**.

3. **Statement C: The transformation of normal cells into cancerous cells occurs only because of chemical agents.**
- **Analysis:** While chemical agents (carcinogens) can cause cancer, there are also physical agents (like UV radiation and gamma rays) that can lead to the transformation of normal cells into cancerous cells. Therefore, this statement is incorrect as it implies exclusivity to chemical agents.
- **Conclusion:** This statement is **False**.

4. **Statement D: The chemical carcinogen present in tobacco smoke is a major cause of lung cancer.**
- **Analysis:** Tobacco smoke contains several chemical carcinogens known to significantly increase the risk of lung cancer. This statement is accurate.
- **Conclusion:** This statement is **True**.

### Summary of Statements:
- A: True
- B: False
- C: False
- D: True

### Final Conclusion:
The correct option based on the analysis of the statements is that statements A and D are true, while statements B and C are false.