This male reproductive disease is often a complication of the mumps:

Orchitis is the correct answer because it refers to the inflammation of one or both testicles, which can occur as a complication of mumps, particularly in post-pubertal males. The mumps virus can lead to swelling and tenderness in the testicular area, often resulting in orchitis. This condition can manifest within a few days after the onset of mumps symptoms, such as parotitis (inflammation of the parotid glands).

Other conditions, while related to the male reproductive system, do not typically arise as direct complications of mumps. Testicular torsion involves the twisting of the spermatic cord and is not associated with viral infections. Prostatitis refers to inflammation of the prostate gland, which is unrelated to mumps. An inguinal hernia involves the protrusion of tissue through an opening in the abdominal muscles and is not a complication associated with mumps infection. Thus, orchitis is specifically linked to mumps and stands out as the correct choice in this context.