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
[{'content': 'Amyloid protein in human being is: \nSelect and explain. \nA. 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', 'role': 'user'}, {'content': 'Answer: D \nExplanation: 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.', 'role': 'assistant'}]