This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Autonomic nervous system, Subject name: Pharmacology
All of the following are therapeutic uses of prazosin except: 
Select and explain. 
A. Peripheral vascular disease, B. Phaeochromocytoma, C. Lupus Erythematosus, D. Scorpion sting
C: Lupus Erythematosus
Answer: C: Lupus Erythematosus 
Explanation: Prazosin is a highly selective alpha 1 blocker. It blocks vasoconstriction in peripheral vascular disorders like Raynaud's alpha 1 receptor stimulation- vasoconstriction blockade- vasodilatation Pheochromocytoma is a tumour of adrenal medullary cells that cause excess catecholamine secretion that result in intermittent or persistent hypeension. Scorpion sting causes hypeension that can be treated with prazosin. From essential of medical pharmacology K D Tripathi 7th edition page no 142,143