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': 'Z score criteria applicable to \nSelect and explain. \nA. Chi-sqare test, B. skewed deviation, C. Normal distribution, D. Paired’t’ test', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]