Extract the answer to the question from the following context.
Question: Which of the following things cannot be rated on taste: juices, aggressiveness, or chicken-wing sauce?
Context: Alison Jing Xu, assistant professor of management at the University of Toronto Scarborough and Aparna Labroo of Northwestern University conducted a series of studies analyzing the correlation between lighting and human emotion. The researchers asked participants to rate a number of things such as: the spiciness of chicken-wing sauce, the aggressiveness of a fictional character, how attractive someone was, their feelings about specific words, and the taste of two juices–all under different lighting conditions. In their study, they found that both positive and negative human emotions are felt more intensely in bright light. Professor Xu stated, "we found that on sunny days depression-prone people actually become more depressed." They also found that dim light makes people make more rational decisions and settle negotiations easier. In the dark, emotions are slightly suppressed. However, emotions are intensified in the bright light.
aggressiveness
The context given states that the study conducted by Alison Jing Xu and Aparna Labroo found a correlation between lighting and human emotion. The researchers asked participants to rate different attributes of various things under different lighting conditions, including: how attractive someone was; their feelings about specific words (which would be emotional); chicken-wing sauce spiciness (the hotter it is, the more intense an emotion/feeling you get); aggressiveness; two juices’ tastes--all were rated on intensity levels under different lights.
In this paragraph, all items can be associated with literal taste except for “aggressiveness” which refers to a person's personality trait or level of anger.  While aggression is typically viewed as negative behavior there are good types of aggression such as assertive versus passive.