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': 'Green shrinkage occurs in \nSelect and explain. \nA. Gypsum investment, B. Ethylsilicate bonded investment, C. Phosphate bonded investment, D. Anhydrate of gypsum bonded investment', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]