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
Characteristics of normal distribution curve includes: 
Select and explain. 
A. Bell Shaped, B. Symmetrical, C. Mean=median=mode=0, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Characteristics of normal distribution curve:

Bell Shaped
Symmetrical 
Asymptotic – The two tails never touches the X-axis
Standard deviation = variance
Mean=median=mode=0 (Coincide)