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: Dental
[{'content': 'Iliac crest graft should ideally be taken from \nSelect and explain. \nA. Lateral aspect, B. Medial aspect, C. Posterosuperior aspect, D. Antero inferior aspect', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]