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 imperfection seen on the lingual flange of a lower denture caused by rapid heating during a curing cycle is called: \nSelect and explain. \nA. Localised shrinkage porosity, B. Gas inclusion porosity, C. Micro-porosity, D. Surface porosity', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]