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: Microbiology
[{'content': 'Ehlers-Danlos syndrome is a disease affecting _____. \nSelect and explain. \nA. Bone, B. Connective tissue, C. Muscle, D. Joints', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ehlers-Danlos syndromes are characterized by defects in collagen (i.e., connective tissues).', 'role': 'assistant'}]