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
Phaeochromocytoma arises from - 
Select and explain. 
A. Adrenal gland, B. Mediastinum, C. Chest wall, D. Neck
A: Adrenal gland
Answer: A: Adrenal gland 
Explanation: pheochromocytoma is a neuroendocrine tumor of the medulla of adrenal gland ( Harrison 17pg 2270)