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': 'Which of the following increases castability of base metal alloys? \nSelect and explain. \nA. Tin, B. Beryllium, C. Molybdenum, D. Carbon', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Beryllium refines grain size, which increases strength, and lowers the fusion temperature of the alloys, which improves castability. Manganese and silicon also improve the castability of the alloys.\nPhillips 12 ed\xa0 page no 375', 'role': 'assistant'}]