An Adolescent Patient Reports Intermitted Pain and Swelling in Various

An adolescent patient reports intermitted pain and swelling in various joints on the right side including the knee, elbow, wrist, and ankle. A physical examination reveals tenosynovitis and a maculopapular rash. Which diagnostic tests will be most helpful in determining a diagnosis in this patient?

A) Blood cultures and a complete blood count
B) Cultures of the urethra, pharynx, cervix, and rectum
C) Skin lesion scrapings and cultures
D) Urine cultures and renal function studies