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
Who started the 2nd amalgam war in 1920? 
Select and explain. 
A. Hall Huggins, B. Alfred Stock, C. Taveau, D. Crawcour
B: Alfred Stock
Answer: B: Alfred Stock 
Explanation: In mid 1920, a German dentist named Alfred Stock started the so called 2nd amalgam war.
Phillip’s Science of Dental Materials, Pg-8