Which of the following is commonly known as Aspirin?

Aspirin is commonly known as Acetylsalicylic Acid. This nomenclature reflects its chemical structure, where the acetyl group is combined with salicylic acid. Aspirin is widely used for its anti-inflammatory properties, pain relief, and its role in reducing the risk of heart attacks and strokes by preventing blood clots.

The other substances listed serve different purposes: Acetaminophen, for instance, is primarily a pain reliever and a fever reducer, but it does not have the anti-inflammatory properties associated with Aspirin. Ibuprofen is a nonsteroidal anti-inflammatory drug (NSAID) similar to Aspirin but is chemically distinct. Diclofenac is another NSAID used to treat pain and inflammation, yet it is separate from the chemical makeup of Aspirin. Understanding these distinctions helps clarify why Acetylsalicylic Acid is the recognized name for Aspirin.