Characteristics of cancer is

Options

A. All tumors are cancers
B. Cancers show metastasis
C. Cancerous cells show property of contact inhibition
D. All viruses are oncogenic

Answer

To answer the question regarding the characteristics of cancer, we will analyze each of the provided options step by step.

### Step-by-Step Solution:

1. **Understanding Cancer**:
- Cancer is defined as the abnormal and uncontrolled proliferation of cells. These cells grow rapidly and do not respond to the normal regulatory mechanisms that control cell growth and division.

2. **Evaluating the Options**:
- **Option A: All tumors are cancers**:
- This statement is **incorrect**. Not all tumors are cancerous. Tumors can be benign (non-cancerous) or malignant (cancerous). Benign tumors do not invade surrounding tissues or metastasize.

- **Option B: Cancers show metastasis**:
- This statement is **correct**. Metastasis refers to the process by which cancer cells spread from their original site to other parts of the body. This is a key characteristic of malignant tumors.

- **Option C: Cancerous cells show property of contact inhibition**:
- This statement is **incorrect**. Cancer cells lose the ability to undergo contact inhibition, which is the normal process that stops cell growth when cells come into contact with each other. This loss allows cancer cells to continue proliferating uncontrollably.

- **Option D: All viruses are oncogenic**:
- This statement is **incorrect**. While some viruses can cause cancer (oncogenic viruses), not all viruses have this capability. Only specific viruses, such as the human papillomavirus (HPV) and Epstein-Barr virus, are known to be oncogenic.

3. **Conclusion**:
- After evaluating all the options, the only correct statement regarding the characteristics of cancer is **Option B: Cancers show metastasis**.

### Final Answer:
**The correct characteristic of cancer is: Cancers show metastasis (Option B).**