This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Blood, Subject name: Pathology
Blood group antigens chemically are? 
Select and explain. 
A. Carbohydrate, B. Glycoprotein, C. Phospholipids, D. Polysaccharide
B: Glycoprotein
Answer: B: Glycoprotein 
Explanation: Ans is 'b' i.e., Glycoprotein o The ABO antigens are determined to be glycoproteins and glycolipids.