This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bleeding Disorders, Subject name: Pathology
[{'content': 'Defect in Bernard soulier lies in - \nSelect and explain. \nA. Gplb-IX, B. GpIIIa-IIb, C. Gplla-Iilb, D. GpIIIb-IIa', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., GpIb-IX", 'role': 'assistant'}]