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: Medicine
Following blood transfusion, non-cardiogenic pulmonary oedema may sometimes occur because of- 
Select and explain. 
A. RBC incompatibility, B. Antigen-antibody mechanism involving human leucocyte antigen, C. Platelet surface antigen reaction, D. Antibody to IgA in donor plasma
B: Antigen-antibody mechanism involving human leucocyte antigen
Answer: B: Antigen-antibody mechanism involving human leucocyte antigen 
Explanation: None