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
Upper and lower boundaries of confidence interval can be termed as: 
Select and explain. 
A. Confidence index, B. Confidence limit, C. Confidence level, D. None of the above
B: Confidence limit
Answer: B: Confidence limit 
Explanation: Confidence level:
Is the level of hope or expectation fixed at a sufficiently high level while dealing with samples, to ensure high reliability.
Confidence limit: Are the upper and lower boundaries of a confidence interval.