Enbrel is primarily used for which of the following diseases?

Enbrel, also known as etanercept, is primarily used in the treatment of rheumatoid arthritis. This medication is a biologic agent that works by inhibiting tumor necrosis factor (TNF), a substance in the body that leads to inflammation in autoimmune diseases. In rheumatoid arthritis, TNF plays a crucial role in the inflammatory processes that cause joint pain, swelling, and damage. By blocking TNF, Enbrel helps to reduce inflammation and improve the symptoms associated with this chronic condition.

The other conditions listed, such as hepatitis C, prostate cancer, and multiple sclerosis, are not primary indications for Enbrel. Hepatitis C is typically treated with antiviral medications. Prostate cancer treatments usually involve hormone therapy, chemotherapy, or radiation. Multiple sclerosis has its own specific biologic treatments that target different pathways than those affected by Enbrel. Hence, the indication for Enbrel is clearly aligned with rheumatoid arthritis management, making it the appropriate choice.