MSFinals-2162

A 27-year-old man has recently come back from a bachelor party in Latvia. He is experiencing pain while urinating and a white discharge from the tip of his penis. Additionally, he is suffering from a swollen and painful left knee. During the examination, the doctor observes a white discharge from his penis and an erythematosus, tender, and swollen left knee. The man is also running a fever of 38.1 degrees. What is the most probable diagnosis?