input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A 52-year-old man comes to the physician for the evaluation of a painless right-sided scrotal swelling. The swelling started several weeks ago but is not always present. Physical examination shows an 8-cm, soft, cystic nontender right-sided scrotal mass that transilluminates. The mass does not increase in size on coughing and it is possible to palpate normal tissue above the mass. There are no bowel sounds in the mass, and it does not reduce when the patient is in a supine position. Examination of the testis shows no abnormalities. Which of the following is the most likely cause of the mass?   (A) Imbalance of fluid secretion and resorption by tunica vaginalis   (B) Failure of processus vaginalis to obliterate   (C) Extension of abdominal contents through the inguinal canal   (D) Dilation and tortuosity of veins in the pampiniform plexus
output: ['(A) Imbalance of fluid secretion and resorption by tunica vaginalis <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Imbalance of fluid secretion and resorption by tunica vaginalis  (B) Failure of processus vaginalis to obliterate  (C) Extension of abdominal contents through the inguinal canal  (D) Dilation and tortuosity of veins in the pampiniform plexus <> possible answers', '  A 52-year-old man comes to the physician for the evaluation of a painless right-sided scrotal swelling. The swelling started several weeks ago but is not always present. Physical examination shows an 8-cm, soft, cystic nontender right-sided scrotal mass that transilluminates. The mass does not increase in size on coughing and it is possible to palpate normal tissue above the mass. There are no bowel sounds in the mass, and it does not reduce when the patient is in a supine position. Examination of the testis shows no abnormalities. Which of the following is the most likely cause of the mass? <> context']