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
What is the characteristic of normal distribution? 
Select and explain. 
A. Mean = Median = mode, B. Mean is 1, SD-zero, C. Curve skewed towards the left, D. Curve skewed towards the right
A: Mean = Median = mode
Answer: A: Mean = Median = mode 
Explanation: None