This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Medicine
[{'content': "Which of the following is not done before ABG: \nSelect and explain. \nA. Allen's test, B. Heparin to rinse the syringe, C. Flexion of wrist, D. Poking at 45deg angle", 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C. Flexion of wrist* While taking ABG the wrist is generally kept in hyperextension. This is to make the vessel straight and to fix the position (because of tension in hyperextension).* Flexion will make the vessel loose and the vessel will slip easily while poking.* ABG is painful, and radial artery spasm can result in ischemia of the hand in patients with radial dominant circulation.', 'role': 'assistant'}]