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': 'Test for vitality testing is /are: \nSelect and explain. \nA. Measurement of crot surface temperature., B. Dual wavelength spectrometry., C. Transmitted light photo plathysmography., D. All of the above.', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Other than these Xe133 radioisotope is also used for vitality testing.', 'role': 'assistant'}]