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: Social & Preventive Medicine
[{'content': 'Severe hypeension is defined if systolic BP is greater than: \nSelect and explain. \nA. 140, B. 160, C. 180, D. 200', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Classification of blood pressure measurements: Category Systolic BP Diastolic BP Normal <130 <85 High normal 130-139 85-90 Stage 1 hypeension(mild) 140-159 90-99 Stage 2 hypeension(moderate) 160-179 100-109 Stage 3 hypeension(severe) >180 >110 Ref: Park 21st edition, page 344', 'role': 'assistant'}]