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': 'Q30 Which of the following is not a type of wax: \nSelect and explain. \nA. Ceresin wax., B. Japan wax., C. Sticky wax., D. Candelilla wax.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Japan wax and cocoa butter are the types of fat.', 'role': 'assistant'}]