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: Social & Preventive Medicine
[{'content': '"Hitler intended to improve German race by killing the weak and defective"- this is an example of: \nSelect and explain. \nA. Positive eugenics, B. Negative eugenics, C. Euthenics, D. Gene therapy', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Negative eugenics has little application in civilized world. People suffering from serious hereditary diseases may be sterilized or otherwise debarred from producing children. Ref: Park 21st edition page: 767.', 'role': 'assistant'}]