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: Biochemistry
[{'content': 'Clusters of twisted strands of β sheet are called \nSelect and explain. \nA. Amphiphatic helices, B. β barrels, C. Loops and bends, D. Supersecondary structures', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Most β sheets are not perfectly flat but tend to have a right-handed twist. Clusters of twisted strands of β sheet, sometimes referred to as β barrels, form the core of many globular proteins.\nRef: Harper’s illustrated biochemistry. 30th edition page no: 39', 'role': 'assistant'}]