This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Statistical Tests, Subject name: Social & Preventive Medicine
All are true about Chi-Square test except 
Select and explain. 
A. It is a 'non-parametric test' of significance, B. It is used to 'test significance of association between 2 or more qualitative characteristics', C. Sample must be randomly selected, D. Lowest expected frequency should be less than 5
D: Lowest expected frequency should be less than 5
Answer: D: Lowest expected frequency should be less than 5 
Explanation: Chi-Square test: It is a 'non-parametric test' of significance. It is used to 'test significance of association between 2 or more qualitative characteristics'. Sample must be randomly selected. Lowest expected frequency should be more than 5. The Fisher exact test tends to be employed instead of<a href=" test</a> when sample sizes are small.