This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Etiological Factors of Neoplasia, Subject name: Pathology
[{'content': 'Secondaries are common in all, except: \nSelect and explain. \nA. Skull, B. Hand and feet bones, C. Proximal limb bones, D. Veebrae', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Metastasis may occur any bone but most commonly involve axial skeleton (e.g. veebra, pelvis, ribs,skull, sternum) > Proximal femur > humerus. Metastasis in small bone of hand and feet are uncommon and usually originates in cancer of lung, kidney and colon', 'role': 'assistant'}]