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': 'Slow Or soft start Polymerization is seen in: \nSelect and explain. \nA. L.E.D light cure units., B. Laser light cure units., C. QTH light cure units., D. PAC light cure units.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]