This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Acute coronary syndrome, Subject name: Medicine
[{'content': 'A 46-year-old female presents to casuality with chest pain. Her BP is 140/80mmHg, hea rate 90bpm, and saturations 99% on roomair. What should be yournext step ? \nSelect and explain. \nA. Administeroxygen, B. Administer analgesia, C. Give aspirin300mg, D. Perform a 12-leadECG', 'role': 'user'}, {'content': 'Answer: D \nExplanation: An ECG should be performed as soon as possible as prompt diagnosis of ST elevation MI is essential. The majority of patients presenting with chest pain are of non-ischaemic origin and so the other treatments may not be necessary. If ACS is suspected, aspirin should be given first. Oxygen is not recommended in the chest pain management unless saturations are <94%', 'role': 'assistant'}]