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
In Familial hypercholesterolemia there is deficiency of 
Select and explain. 
A. LDL receptor, B. Apoprotein A, C. Apo protein C, D. Lipoprotein lipase
A: LDL receptor
Answer: A: LDL receptor 
Explanation: LDL receptors 

Familial hypercholesterolemia (type IIa) is due to deficiency of functional LDL receptors as a result of different types of mutations.