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
Ehlers-Danlos syndrome is a disease affecting _____. 
Select and explain. 
A. Bone, B. Connective tissue, C. Muscle, D. Joints
B: Connective tissue
Answer: B: Connective tissue 
Explanation: Ehlers-Danlos syndromes are characterized by defects in collagen (i.e., connective tissues).