This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General obstetrics, Subject name: Gynaecology & Obstetrics
A female presents with significant blood loss du&;>> postpaum haemorrhage (PPH). What would be the shock index (HR/systolic BP)? 
Select and explain. 
A. .7-0.9, B. 0.5-0.7, C. 0.9-1.1, D. 0.1-0.5
C: 0.9-1.1
Answer: C: 0.9-1.1 
Explanation: Shock index = Hea rate/Systolic BP Normal = 0.5-0.7 If it becomes 0.9-1.1 it indicates massive blood loss and need for intensive resuscitation Ref: Fernando Arias 4e pg 391.