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What is a characteristic of malignant tumors?

  1. They do not spread

  2. They grow slowly

  3. They are noncancerous

  4. They can invade nearby tissues

The correct answer is: They do not spread

Malignant tumors are tumors that can spread and invade nearby tissues. This characteristic is what distinguishes them from noncancerous (benign) tumors, which do not have the ability to invade and spread. Malignant tumors also tend to grow quickly, which is different from the characteristic of growing slowly as seen in noncancerous tumors. Therefore, options B and C can be ruled out as they do not accurately describe malignant tumors. Option D is incorrect because it states that malignant tumors "can invade nearby tissues", while the correct statement should be "they can invade nearby tissues". In other words, the correct option should include an absolute statement like option A stating that malignant tumors "do not spread", not that they "can spread".