In Glanzman's thrombasthenia, there is a defect of: (A) Gp IIb / IIa, (B) Gp IIb / IIIa, (C) Gp Ib / IX, (D) Gp IIb / IX
Answer is B. Glanzman's thrombasthenia

Platelet aggregation defect
IIb / IIIa Gp deficient