This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Haematology, Subject name: Pathology
[{'content': 'Bernard Soulier syndrome is due to defect in \nSelect and explain. \nA. GP IB/IX, B. GP IIB/IIIa, C. Fibrinogen, D. vWF', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Bernard-Soulier syndrome (BSS), is a rare autosomal recessive bleeding disorder that causes a deficiency of glycoprotein Ib(GpIb), the receptor for von Willebrand factor Causes Mutations in GP1BA, GP1BB and GP9 Diagnostic method Flow cytometry analysis Treatment Platelet transfusion', 'role': 'assistant'}]