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: Surgery
[{'content': 'An isograft indicates transfer of tissues between: \nSelect and explain. \nA. Related donors, B. Monozygotic twins, C. Parts of same individual, D. Unrelated donors', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]