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: Pharmacology
[{'content': "Test normally undeaken to demonstrate the presence of collateral circulation of hand is NOT RELATED-SURGERY \nSelect and explain. \nA. Kety Schmidt test, B. Allen's test, C. Sellick's test, D. Swan Ganz test", 'role': 'user'}, {'content': "Answer: B \nExplanation: Allen's test is done to determine the presence of collateral circulation of hand before cannulating radial aery.", 'role': 'assistant'}]