A 48-year-old male had a sudden scrotal pain for 4 hours, which radiated significantly to the inguinal region. Physical examination revealed obvious redness and swelling of the right scrotum, increased skin temperature, and epididymis swelling as a lump, which was not easy to distinguish and had obvious tenderness, so the patient was most likely to be A: Acute cystitis B: Acute prostatitis C: Scrotum hernia D: Acute epididymitis