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
A female presents with significant blood loss due to post-partum haemorrhage (PPH). What would be the shock index (HR/systolic BP)? 
Select and explain. 
A. 0.3-0.5, B. 0.5-0.7, C. 0.7-0.9, D. 0.9-1.1
D: 0.9-1.1
Answer: D: 0.9-1.1 
Explanation: Shock index = heartrate/systolic BP
Normal = 0.5–0.7
If it becomes 0.9–1.1 it indicates massive blood loss and need for intensive resuscitation.