Anatomy Which one of the following statements regarding collagen is true? A 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. 💡 Explanation Which one of the following statements regarding collagen is true? ✓ Correct Answer: A. It is composed of Tropocollagen.