This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Glands & Connective tissue, Subject name: Anatomy
[{'content': 'Which one of the following statements regarding collagen is true? \nSelect and explain. \nA. It is composed of Tropocollagen., B. Reticular Fibers are composed of type II collagen., C. It is synthesized mostly by Mast cells., D. Elastic Fibers are composed of type IV collagen.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Collagen is composed of closely packed Tropocollagen Molecules. Reticular Fibers are composed of type III collagen, Elastic Fibers are composed of Elastin microfibrils rather than collagen. Collagen is synthesized by Fibroblasts not mast cells.', 'role': 'assistant'}]