This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Radiotherapy, Subject name: Radiology
[{'content': 'Tissue or tumor-specific tumor markers are all Except \nSelect and explain. \nA. PSA, B. Calcitonin, C. Cathecolamines, D. LDH', 'role': 'user'}, {'content': 'Answer: D \nExplanation: LDH, it is elevated in many hematological malignancies and Ewing&;s sarcoma, it is considered as a representative of tumor burden.Reference: Harrison; 19th edition', 'role': 'assistant'}]