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: Pathology
[{'content': 'Pheochromocytoma is a neoplasm derived from \nSelect and explain. \nA. Chromaffin cells, B. Paraganglia in neck, C. An adrenal gland tumor due to nephrogenic rest, D. Primitive totipotential cells', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Pheochromocytomas are neoplasms composed of chromaffin cells, which synthesize and release catecholamines and in some instances peptide hormones. Pheochromocytomas that develop in extra-adrenal paraganglia are designated paragangliomas Robbins 9e pg: 1134 Ref img', 'role': 'assistant'}]