A Medical Student Is Assessing a 22-Year-Old Male Who Has

A medical student is assessing a 22-year-old male who has come to the emergency department because of pain and swelling in his scrotum over the past 36 hours. The attending physician has told the student that she suspects epididymitis. Which of the medical student's following questions is most likely to be useful in the differential diagnosis of epididymitis?

A) "Do you know if your vaccinations for mumps are up to date?"
B) "Have you had unprotected sex in the past?"
C) "Do you have a sensation of heaviness in the left side of your scrotum?"
D) "Has it been painful when you get an erection lately?"