This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General surgery, Subject name: Surgery
[{'content': 'All are differential diagnosis for acute scrotum except \nSelect and explain. \nA. Epididymitis, B. Hydatid torsion, C. Testicular torsion, D. Testicular cancer', 'role': 'user'}, {'content': 'Answer: D \nExplanation: In testicular malignancy, Usually, the patient presents with a painless testicular lump.A sensation of heaviness can occur if the testis is two or three times its normal size, but only a minority of patients experience pain.The hydatid of Morgagni (appendix testis) is a small embryological remnant at the upper pole of the testis. Can occasionally, undergo torsion, causing acute one-sided testicular pain. One-third of patients present with a palpable "blue dot" discoloration on the scrotum. (blue-dot sign)Ref: Bailey and Love 27e pg: 1507', 'role': 'assistant'}]