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31. A 19-year-old African-American college student comes to the student health center because of pain in her right knee and fever. She says the pain began about 4 days ago, and she does not recall injuring her knee. Her only medication is an oral contraceptive pill. She is generally healthy. Vital signs are: temperature 37.7°C (99.8°F), pulse 96/min, respirations 20/min and blood pressure 120/72 mm Hg. She appears uncomfortable. Physical examination is normal except for her right knee, which is red, swollen and tender with a tense effusion. Which of the following tests is most likely to support the diagnosis?

A) Cervical cultures
B) MRI of the knee
C) Plain x-ray film of the knee
D) Serum antinuclear antibody titer
E) Serum uric acid concentration


Why not choose B ? Thanks

aaa........

seems like she has a gono arthrits .......culture from cervical , throat any one can support the diagnosis

AAA