Final answer:
Chronic illness is not considered a psychological source of stress as it represents a physical condition, whereas the other options (unrealistic expectations, negative self-talk, and major life events) are associated with cognitive and emotional aspects of stress.
Step-by-step explanation:
The question asks to identify which of the options provided is not a psychological source of stress. The psychological sources of stress typically involve elements such as Unrealistic expectations, Negative self-talk, and Major life events. These factors are associated with the cognitive and emotional aspects of stress. However, a Chronic illness does not fit into this category as it is considered a physical condition that can certainly cause stress but is itself not a psychological source of stress. The other options—unrealistic expectations, negative self-talk, and major life events—pertain to cognitive and emotional processes that contribute to a person's stress levels.