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: Anatomy
Glycoprotein IIb-IIIa complex is deficient in 
Select and explain. 
A. Bernard soulier syndrome, B. Glanzmann disease, C. Von willibrand disease, D. Gray platelet syndrome
B: Glanzmann disease
Answer: B: Glanzmann disease 
Explanation: Inherited deficiency of GpIIb-IIIa results in a bleeding disorder called Glanzmann thrombasthenia.(ref Robbins 9th/118)