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': 'The yield strength of Austenite (NiTi alloy) is: \nSelect and explain. \nA. 100 Mpa, B. 240 Mpa, C. 560 Mpa, D. 700 Mpa', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]