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
Plasma expanders are used in : 
Select and explain. 
A. Severe anemia, B. Severe trauma, C. Pulmonary oedema, D. Cardiac failure
B: Severe trauma
Answer: B: Severe trauma 
Explanation: None