What is the main use of nonsteroidal anti-inflammatory drugs (NSAIDs)?

Nonsteroidal anti-inflammatory drugs (NSAIDs) are primarily utilized for their pain-relieving and anti-inflammatory properties. They are effective in managing conditions such as arthritis, which involves inflammation of the joints, and for alleviating mild to moderate pain from various causes, including headaches, menstrual cramps, and minor injuries. The mechanism of action of NSAIDs involves the inhibition of enzymes called cyclooxygenases (COX), which play a crucial role in producing prostaglandins that mediate inflammation and pain. By reducing the levels of these substances, NSAIDs provide symptomatic relief and improve quality of life for individuals experiencing chronic pain or inflammatory conditions.

In contrast, the other options do not align with the main function of NSAIDs, as they are not designed to treat allergic reactions, prevent infections, or promote muscle growth. Each of these functions is associated with different classes of medications, making option B the most appropriate choice for the primary use of NSAIDs.