This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nutrition, Subject name: Medicine
[{'content': 'Fasting hyperglycemia is almost always seen in \nSelect and explain. \nA. Gastric carcinoma, B. Pheochromocytoma, C. Adrenal tumour, D. Carcinoid tumour', 'role': 'user'}, {'content': 'Answer: B \nExplanation: fasting glucose levels greater than or equal to 7.0 mmol/l, is frequently present in patients with phaeochromocytoma (24% in the present study) and the diabetes is reversed by removal of the tumour(pheochromocytoma). Ref - Harrison20th edition pg 99', 'role': 'assistant'}]