Two neighboring cities A and B have the same population features and a similar proportion of older people. City A has wider spaces, more spacious lawns and generally more health friendly environs. Yet the number of dentists, ophthalmologists and other health specialists in City A is much more than that in City B, and on the whole they are doing better business than their counterparts in City B. This indicates that people in City B maintain better health than people in City A.
Which of the following, if true, could be the most logical reason for the paradox?
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