This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urethra & Penis, Subject name: Surgery
[{'content': '28 year patient from Bihar presents with on and off pain in right scrotum and then gradual onset swelling develops over the duration of 2 years. Trans illumination test is positive. Top of testis can be reached. The probable diagnosis is: \nSelect and explain. \nA. Right hydrocele, B. Right inguinal hernia, C. Right epididymal cyst, D. Right encysted hydrocele of cord', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Right hydroceleRef: Bailey 26th Edition, page 1382HYDROCELE OF TESTISHydrocele are trans illuminant and it is possible to get above the swelling on examination of the scrotum.', 'role': 'assistant'}]