This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
[{'content': 'A/E used to detect Ca. prostate gland :a) PSAb) MRIc) CT Scand) DSAe) TRUS \nSelect and explain. \nA. abc, B. acd, C. bcd, D. bd', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Investigation used to detect Ca Prostate are PSA & TRUS (including TRUS guided biopsy)\nCross-sectional imaging by CT/MRI of the pelvis are used for staging purpose (excluding lymph node metastasis)\nX-rays bone scans are used to detect lung & bone metastases.', 'role': 'assistant'}]