General Medicine General c23409ea This patient came with this complaint one month after an extramarital sexual contact. He has no pain. Which one of the following statements is true? A A single dose of 2.4 million units of benzathine penicillin IM is the treatment B Examination of the groin will reveal a characteristic Groove Sign C It is caused by Hemophilus ducreyi D He is likely to develop ahritis of the knee