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 β (Beta) hemihydrate of gypsum requires more water to float its powder particles because \nSelect and explain. \nA. They are more regular in shape and dense, B. They are more regular in shape and highly porous, C. They are more irregular in shape and porous, D. They are more dense and prismatic in shape', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]