This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nuclear medicine, Subject name: Radiology
[{'content': 'FDG-PET negative tumor is: \nSelect and explain. \nA. Atypical carcinoid, B. Typical carcinoid, C. Small cell carcinoma, D. Large cell neuroendocrine carcinoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: * 18 FDG negative tumors - Have low mitotic & low metabolic activity (M-TB) - Mucinous Ca- Typical carcinoids- Bronchoalveolar Ca', 'role': 'assistant'}]