Which of the following is known as a painkiller?

The term "painkiller" is commonly used to refer to medications that alleviate pain, which aligns with the classification of analgesics. Analgesics work by inhibiting the mechanisms that cause pain sensations in the body, providing relief for both acute and chronic conditions. They are often utilized in various settings, including after surgeries, in the management of chronic pain, or for headaches and muscle aches.

While antibiotics target bacterial infections, anticoagulants are used to prevent blood clots, and antipyretics are primarily aimed at reducing fever, none of these classifications serve the role of managing pain directly, which is the primary function of analgesics. Therefore, recognizing analgesics as painkillers underscores their vital role in patient care, particularly in contexts where pain management is a priority.