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: Biochemistry
[{'content': 'In Familial hypercholesterolemia there is deficiency of \nSelect and explain. \nA. LDL receptor, B. Apoprotein A, C. Apo protein C, D. Lipoprotein lipase', 'role': 'user'}, {'content': 'Answer: A \nExplanation: LDL receptors\xa0\n\nFamilial hypercholesterolemia (type IIa) is due to deficiency of functional LDL receptors as a result of different types of mutations.', 'role': 'assistant'}]