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: Biochemistry
Pheochromocytoma are tumours of: 
Select and explain. 
A. Adrenal cortex, B. Adrenal medulla, C. Pancreas, D. Bone
B: Adrenal medulla
Answer: B: Adrenal medulla 
Explanation: Ans. B. Adrenal medullaPheochromocytoma are a type of tumor of the adrenal glands that can release high levels of epinephrine and norepinephrine. As the name implies, the "ad-renal" glands are located near the "renal" area. Someone with a pheochromocytoma usually has three classic symptoms, headache, sweating, and heart palpitations (a fast heart beat) in association with markedly elevated blood pressure (hypertension). Other conditions that may accompany these classic symptoms are as follows:a. Anxiety,b. Nausea,c. Tremors,d. Weakness,e. Abdominal pain, andf. Weight loss.