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: Pathology
[{'content': 'Articular cartilage is made up of - \nSelect and explain. \nA. Type I collagen, B. Type II collagen, C. Type III collagen, D. Type IV collagen', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Collagen is the main protein of connective tissue in animals and the most abundant protein in mammals, making up\xa0about 25% of the whole-body protein content.\nTough bundles of collagen called collagen fibres\xa0are a major component of the extracellular matrix that supports\xa0most tissues and gives cells structure from the outside, but collagen is also found inside certain cells. Collagen has\xa0the great tensile strength and is the main component of fascia, cartilage, ligaments, tendons, bone and teeth.\xa028 types of collagens have been found (so far) in humans.\nOver 90% of the collagen in the body, however, are of type I, II, III, and IV.', 'role': 'assistant'}]