Metastasis is associated with:

Options

A. Benign tumour
B. Malignant
C. Both benign and malignant tumour
D. Crown gall tumour

Answer

**Step-by-Step Solution:**

1. **Understanding Metastasis**: Metastasis refers to the process by which cancer cells spread from the primary site (where they originated) to other parts of the body, forming secondary tumors.

2. **Types of Tumors**: There are two main types of tumors:
- **Benign Tumors**: These are non-cancerous growths that do not invade nearby tissues or spread to other parts of the body. They grow slowly and are usually encapsulated.
- **Malignant Tumors**: These are cancerous growths that can invade nearby tissues and have the potential to spread (metastasize) to distant organs.

3. **Association of Metastasis**: Since metastasis involves the spread of cancerous cells, it is specifically associated with malignant tumors. Benign tumors do not have the ability to metastasize because their cells are non-cancerous and do not proliferate uncontrollably.

4. **Conclusion**: Therefore, the correct answer to the question "Metastasis is associated with:" is **malignant tumors**.

**Final Answer**: Metastasis is associated with malignant tumors.

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