As of 2011, incidence of which chronic disease had more than doubled tripled over the previous 31 years?

The correct answer is diabetes.

Explanation:

The number of individuals suffering from diabetes has elevated from 108 in 1980 to 422 million in 2011. According to the global survey of diabetes, in the adults, that is, above the age of 18, the occurrences of diabetes has risen from 4.7 percent in 1980 to 8.5 percent in 2011.  

Diabetes has become more common in the low income and middle-class countries. It is a prime cause of kidney failure, blindness, strokes, and limb amputation. The treatment of diabetes and its outcomes can be delayed or prevented with physical activity, diet, regular screening, medication, and treatment for issues.  

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