This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Haemolytic disease of newborn is an example of 
Select and explain. 
A. Type 3 hypersensitivity reaction, B. Type2 hypersensitivity reaction, C. Ahur reaction, D. Type 4 hypersensitivity reactions
B: Type2 hypersensitivity reaction
Answer: B: Type2 hypersensitivity reaction 
Explanation: Ref Robbins 7/e p211,9/e p206 Autoimmune hemolytic Anemia Red cell membrane proteins (Rh blood group antigens, I antigen) Opsonization and phagocytosis of erythrocytes Hemolysis, anemia Autoimmune thrombocytopenic purpura thrombocytopenic Platelet membrane proteins (GpIIb/IIIa integrin) Opsonization and phagocytosis of platelets..leads to bleeding..type 2 hypersensitivity reaction