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 procedure is indicated to produce cross-linking in the polymerization of linear chains of acrylic: \nSelect and explain. \nA. Addition of grain refining agents, B. Addition of difunctional monomers, C. Increasing the amount of heat required for linear polymerization, D. Incorporation of terminating agents', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]