This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
All-cause weight gain, except - 
Select and explain. 
A. Pheochromocytoma, B. Cushing's syndrome, C. Hypothyroidism, D. Insulin secreting tumor
A: Pheochromocytoma
Answer: A: Pheochromocytoma 
Explanation: None