Which of the following best describes the difference between benign and malignant tumors?

• A. Benign tumors do not invade surrounding tissues, while malignant tumors can invade and spread to other parts of the body.
• B. Benign tumors grow faster than malignant tumors.
• C. Benign tumors are caused by viruses, while malignant tumors are caused by bacteria.
• D. Benign tumors are always fatal, while malignant tumors are harmless.

Answer: (A)

Verified step by step guidance

1. Understand the key characteristics of tumors: Tumors are abnormal growths of cells. They can be classified as benign or malignant based on their behavior and impact on the body.
2. Define benign tumors: Benign tumors are non-cancerous growths that do not invade surrounding tissues or spread to other parts of the body. They typically grow slowly and are often encapsulated, making them easier to remove surgically.
3. Define malignant tumors: Malignant tumors are cancerous growths that have the ability to invade nearby tissues and spread (metastasize) to distant parts of the body through the bloodstream or lymphatic system. They are more aggressive and pose a greater threat to health.
4. Compare the options provided: Evaluate each statement in the problem. For example, 'Benign tumors grow faster than malignant tumors' is incorrect because benign tumors generally grow slower. Similarly, 'Benign tumors are caused by viruses, while malignant tumors are caused by bacteria' is incorrect because tumors are not typically caused by these pathogens. Lastly, 'Benign tumors are always fatal, while malignant tumors are harmless' is incorrect because benign tumors are rarely fatal, and malignant tumors are dangerous.
5. Select the correct answer: Based on the definitions and comparisons, the correct answer is 'Benign tumors do not invade surrounding tissues, while malignant tumors can invade and spread to other parts of the body.' This accurately describes the fundamental difference between the two types of tumors.