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Which one of the following statements is correct?

1. Benign tumours show the property of metastasis.
2. Heroin accelerates body functions.
3. Malignant tumours may exhibit metastasis.
4. Patients who have undergone surgery are given cannabinoids to relieve pain.

Correct answer: Malignant tumours may exhibit metastasis.

Solution

Malignant tumours are invasive and can spread to distant tissues through blood or lymph, which is called metastasis. Benign tumours do not metastasize, heroin is a depressant rather than a stimulant, and cannabinoids are not the standard routine pain relief after surgery.

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