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
Environmental manipulation to enable BEST expression of genotype is known as: 
Select and explain. 
A. Eugenics, B. Euthenics, C. Gene therapy, D. Euthanasia
B: Euthenics
Answer: B: Euthenics 
Explanation: Euthenics deals with the "improvement" through altering external factors and environment to enable adequate expression of genotype. Ref: Park 21st edition page: 767.