This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Medicine
[{'content': 'All are true about pheochromocy except- \nSelect and explain. \nA. 90% are malignant, B. 95% occur in the abdomen, C. They secrete catecholamines, D. They arise from symathetic ganlions', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 10% malignant ( Harrison 17 pg 2269)', 'role': 'assistant'}]