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
Pheochromocytoma is a neoplasm derived from 
Select and explain. 
A. Chromaffin cells, B. Paraganglia in neck, C. An adrenal gland tumor due to nephrogenic rest, D. Primitive totipotential cells
A: Chromaffin cells
Answer: A: Chromaffin cells 
Explanation: 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