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.
(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

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, we need to evaluate each statement regarding cancer and determine whether they are true or false. Here’s the step-by-step solution:

### Step 1: Evaluate Statement A
**Statement A**: "Cancer cells lose the property of contact inhibition."
- **Analysis**: Contact inhibition is a mechanism that stops cells from dividing when they come into contact with each other. Cancer cells often lose this property, leading to uncontrolled growth.
- **Conclusion**: This statement is **True**.

### Step 2: Evaluate Statement B
**Statement B**: "The property of metastasis is mostly found in benign tumors."
- **Analysis**: Metastasis refers to the spread of cancer cells to other parts of the body. This property is characteristic of malignant tumors, not benign tumors, which do not spread.
- **Conclusion**: This statement is **False**.

### Step 3: Evaluate Statement C
**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 other factors such as radiation and biological agents that can lead to the transformation of normal cells into cancerous cells. Therefore, it is not limited to chemical agents alone.
- **Conclusion**: This statement is **False**.

### Step 4: Evaluate Statement D
**Statement D**: "The chemical carcinogen present in tobacco smoke is a major cause of lung cancer."
- **Analysis**: Tobacco smoke contains several carcinogens, and it is indeed a major cause of lung cancer. One of the well-known carcinogens in tobacco is N-Nitrosodimethylamine.
- **Conclusion**: This statement is **True**.

### Final Summary of Evaluations:
- A: True
- B: False
- C: False
- D: True

### Step 5: Select the Correct Option
Based on our evaluations, the correct option is:
**(a) A - True, B - False, C - False, D - True**