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': 'Type4 Ehlers-Danlos syndrome is characterized by: \nSelect and explain. \nA. Deficiencies in hydroxylase and lysyl oxidase., B. Decreased amount of type III collagen., C. Nonfunctioning plasma fibronectin., D. All of the above.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: In EDS types I and II, the classic variety, causative mutations may involve the COL5A1, COL5A2, and tenascin-X genes.\xa0Type IV is characterized by a decreased amount of type III\xa0collagen. Types V and VI are characterized by deficiencies in\xa0hydroxylase and lysyl oxidase, an important posttranslational\xa0modifying enzyme in collagen biosynthesis. Type VII has an\xa0amino-terminal procollagen peptidase deficiency. Type IX\xa0has abnormal copper metabolism. Type X has nonfunctioning\xa0plasma fibronectin.', 'role': 'assistant'}]