One of these things is not like the others
Please go to the Question #11 post if you haven't had a chance work on this one yet, since the text below contains the solution.
Most of the items on the list are temperaments -- specifically, those related to the ancient theory of bodily humors. It was once believed that imbalances in these humors was the source of disease. An excess of blood caused one to be sanguine. Black bile would make you melancholic. And phlegmatic personality types were caused by an excess of ... yes ... phlegm.
The fourth humor which I left off the list was is choleric. Esoteric is not a bodily humor, or a temperament, so it does not belong. It is not like the others.