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: Medicine
[{'content': 'All except one are each feature of acute pericarditis \nSelect and explain. \nA. Concave ST elevation, B. PR segment elevation, C. J point elevation, D. Absent of reciprocal ST depression', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Acute pericarditis is characterised by PR segment depression', 'role': 'assistant'}]