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: Pharmacology
Alpha- blockers are used in all except 
Select and explain. 
A. Pheochromocytoma, B. Migraine, C. Thyrotoxicosis, D. Secondary shock
C: Thyrotoxicosis
Answer: C: Thyrotoxicosis 
Explanation: None