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': 'Mean, Median and mode all are zero. The type of distribution is ? \nSelect and explain. \nA. Standard normal, B. Negatively skewed, C. Positively skewed, D. J shaped', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Standard normal", 'role': 'assistant'}]