This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Proteins and Amino Acids, Subject name: Biochemistry
Amyloid protein in human being is: 
Select and explain. 
A. A naturally present protein in normal individuals, B. Involves selectively blood vessels, C. Is visible by naked eyes as whitish cheesy material, D. A material which gets deposited in extracellular spaces
D: A material which gets deposited in extracellular spaces
Answer: D: A material which gets deposited in extracellular spaces 
Explanation: Ans. D. A material which gets deposited in extracellular spaces(Ref. Robbins and Cotran Pathologic basis of Disease 9/e Chapter 6)Amyloid FibrilsPhysical nature of amyloidX-ray crystallography and infrared spectroscopy demonstrate a characteristic cross-b-pleated sheet conformation.