This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Physiology
The most common site of ectopic pheochromocytoma is 
Select and explain. 
A. Bladder, B. Filum terminale, C. Celiac plexus, D. Organ of Zuckerkandl
B: Filum terminale
Answer: B: Filum terminale 
Explanation: Pheochromocytoma is a chromaffin cell tumor commonly located at adrenal medulla. Ectopic pheochromocytoma (EP) is considered as pheochromocytomalocated at extra-adrenal site, which usually lies at para-aoic region Ref ganong's review of medical physiology 25e