Given the task definition and input, reply with output. In this task, you are given a question and answer options for that question. Using this information, you have to classify each text into different topics: medicine, nursery, psychology, chemistry, pharmacology, biology.

Question: What would be the differential characteristic between an eating disorder and another that presents with significant weight loss and / or anomalous eating patterns ?: 
 Options:  <0> The sleep problems. <1> The pathological fear of getting fat or the overestimated idea of ​​losing weight. <2> The social difficulties. <3> The high anxiety. <4> The fear of malnutrition.

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
psychology