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: Pharmacology
[{'content': 'Absolute contraindication to thrombolytic therapy is : \nSelect and explain. \nA. Pregnancy, B. History of hemorrhagic stroke in past one year, C. Patients on nitrates, D. Hypertension', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]