Which symptom is commonly associated with hemophilia?

Hemophilia is a genetic disorder that impairs the body's ability to make blood clots, which is critical for stopping bleeding. One of the hallmark symptoms of hemophilia is hemarthrosis, which refers to bleeding into the joints. This can lead to swelling, pain, and reduced mobility in affected joints, typically the knees, elbows, and ankles. Recurrent episodes of hemarthrosis can cause long-term joint damage and complications if not appropriately managed.

Other symptoms associated with hemophilia may include easy bruising, prolonged bleeding after injuries or surgeries, and in severe cases, spontaneous bleeding. However, hemarthrosis stands out as a prominent and defining feature specifically linked to the disorder, making it the correct answer in this context.