The search to hide natural body odors led to the discovery and use of musk. Musk is a scent used in perfumes. It is obtained from the sex glands of the male musk deer, a small deer native to the mountainous regions of the Himalayas. The odor of musk, penetrating and persistent, is believed to act as an aphrodisiac. In animals, musk serves the functions of defining territory, providing recognition, and attracting mates.

The word persistent in the passage is closest in meaning to

• constant
• attractive
• disruptive
• pleasant