This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Biostatistics, Subject name: Social & Preventive Medicine
[{'content': 'Height to weight is a/an \nSelect and explain. \nA. Association, B. Regression, C. Propoion, D. Index', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ref: Parks 23rd edition pg 852 Height and weight are association. In order to find out whether there is significant association or not between the two variables , coefficient or Corelation is calculated . r lies between -1 and +1 r near -1 : indicates strong negative correlation . r = 0 : indicates no association r near +1: indicates strong positive correlation. Note: correlation does not necessarily prove causation .', 'role': 'assistant'}]