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 of the following are features of acute severe asthma EXCEPT - \nSelect and explain. \nA. Respiratory rate > 25, B. Heart rate > 110, C. PEF < 50% of normal or predicted, D. Temperature > 102°F', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]