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': 'Material causing minimum tissue distortion is: \nSelect and explain. \nA. Polysulphide, B. Silicone, C. Impression plaster, D. Zinc oxide eugenol paste', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Impression plaster is a β-calcium sulfate hemihydrate used at a water/powder ratio of approximately 0.5 to 0.6. Its fluidity\xa0makes it suitable for making impressions of soft tissues in the uncompressed state, a characteristic of mucostatic impression\xa0material.\nRef: Phillip’s Science of Dental Materials ed 12 pg 177', 'role': 'assistant'}]