Antonym of benign in medical terms?

• A. Benign.
• B. Malignant.
• C. Harmless.
• D. Benign tumor.

Answer: (B)

The main idea is understanding how tumors are described in medical terms. Benign refers to a noncancerous growth that tends to be well-contained, grows slowly, and doesn’t invade nearby tissues or spread to distant sites. The opposite behavior is malignant, which describes cancerous tissue that invades, grows more aggressively, and can metastasize. So malignant is the correct antonym because it captures the contrasting, cancerous nature of the growth. Harmless isn’t a precise medical term for this contrast, and a benign tumor is still noncancerous, not the opposite of benign.