Which of the following is a complication of hemophilia?

A. Hematuria (blood in the urine) can occur in some conditions, but it is not a primary complication of hemophilia. Hemophilia more commonly leads to bleeding into joints and muscles rather than the urinary tract. B. Hemarthrosis (bleeding into the joints) is a common complication of hemophilia. It occurs due to the lack of clotting factors, which prevents normal blood clotting and allows bleeding into joints, causing pain, swelling, and long-term joint damage. C. Hemoptysis (coughing up blood) is not a typical complication of hemophilia, though it can occur in various respiratory conditions, such as infections or lung issues. D. Hematemesis (vomiting blood) is a serious condition but is not commonly associated with hemophilia. Hemophilia's major complications are related to joint and muscle bleeding.