Which of the following word pairs are opposite in meaning?

The pairing of "benign" and "malignant" is indeed opposite in meaning. In the context of medical terminology, "benign" refers to a condition that is not harmful or cancerous, while "malignant" indicates a condition, especially a tumor, that is harmful or cancerous. Therefore, these two words are often used to differentiate between types of tumors, with benign tumors usually being less serious and often treatable without extensive intervention, whereas malignant tumors pose significant health risks and can spread throughout the body.

Exploring the other options, "acute" and "chronic" describe different timeframes or severity levels of conditions—acute indicates a severe but short-term condition, while chronic refers to a long-lasting or persistent condition. "Symptomatic" indicates the presence of symptoms, while "asymptomatic" describes the absence of symptoms. Lastly, "condensed" and "diluted" relate to the concentration of substances, with condensed referring to a substance that has been made denser or thicker, and diluted meaning that it has been made thinner or weaker with the addition of another substance, typically water. Thus, while those terms reflect different states or conditions, they do not represent direct opposites in the same way that