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': 'Who started the 2nd amalgam war in 1920? \nSelect and explain. \nA. Hall Huggins, B. Alfred Stock, C. Taveau, D. Crawcour', 'role': 'user'}, {'content': 'Answer: B \nExplanation: In mid 1920, a German dentist named Alfred Stock started the so called 2nd\xa0amalgam war.\nPhillip’s Science of Dental Materials, Pg-8', 'role': 'assistant'}]