Which of the following is not a stress-related disease or disorder? a. stroke b. anger c. heart disease d. temporomandibular joint dysfunction

I'd like to say Anger should be the answer. Stroke's and Heart disease are relatively prone to worsening due to massive amounts of stress, while TMJ which is the degeneration of the joints of the mandible are prone to said degeneration when reactions to stress like grinding or clenching the teeth are done often. 

Anger is more an emotion and is referred to as such. If Chronic Anger was an option used, then I'd go with TMJ.

You can literally find this on google of each science career and search up what type of training you need and how many years in school