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
For testing the statistical significance of the difference in heights of school children among three socio economic groups the most appropriate statistical test is: 
Select and explain. 
A. Student's 't' test, B. Chi-squared test, C. Paired 't' test, D. One way analysis of variance (one way ANOVA)
D: One way analysis of variance (one way ANOVA)
Answer: D: One way analysis of variance (one way ANOVA) 
Explanation: None