Topic: Antonyms, Subject: English Grammar (ইংরেজি গ্রামার)

Best Answer Explained in Below-:

The term "benign" is commonly used to describe something that is gentle, kindly, or harmless. In medical contexts, it often refers to conditions or tumors that do not pose a threat to health or life. To understand its antonym, we look for a word that conveys the opposite meaning.

Among the provided options, "malignant" stands out as the correct antonym. "Malignant" describes something that is harmful, potentially dangerous, and often indicative of severe diseases, such as cancer. In contrast to benign tumors, which are non-invasive and may not require aggressive treatment, malignant tumors can spread aggressively and pose significant health risks.

The other options—"tenfold," "peaceful," and "blessed"—do not relate to the essence of harm or health impact, making them unsuitable antonyms for "benign." "Tenfold" refers to multiplication or increase, "peaceful" denotes tranquility, and "blessed" signifies something that is favored or holy—all of which lack the connotations of threat or danger. Thus, "malignant" is the most fitting term that captures the essence of what it means to be the opposite of benign.