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Which of the following is not a characteristic of a tumor?

  1. Abnormal cell mass

  2. Changes in color

  3. Varying size and shape

  4. Contains a head of pus

The correct answer is: Contains a head of pus

Tumors are abnormal cell masses that can be identified through physical changes such as changes in size, shape, and color. The other options, A, B, and C, all accurately describe characteristics of tumors. However, option D, which suggests a tumor contains a head of pus, does not align with the definition of a tumor as it is not a common characteristic.