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: Gynaecology & Obstetrics
[{'content': 'A female presents with significant blood loss due to post-partum haemorrhage (PPH). What would be the shock index (HR/systolic BP)? \nSelect and explain. \nA. 0.3-0.5, B. 0.5-0.7, C. 0.7-0.9, D. 0.9-1.1', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Shock index = heartrate/systolic BP\nNormal = 0.5–0.7\nIf it becomes 0.9–1.1 it indicates massive blood loss and need for intensive resuscitation.', 'role': 'assistant'}]