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: Pathology
Defect of glanzmann's thrombosthenia is ? 
Select and explain. 
A. Gp1Ib-IlIa, B. GpIIIa-I lb, C. GpIla-Illb, D. Gpfilb-I la
A: Gp1Ib-IlIa
Answer: A: Gp1Ib-IlIa 
Explanation: Ans. is 'a' i.e., GpI1b-IlIa