Consider the question. Jamie is returning to work today. He was forced to leave work because some bad things had happened and his serotonin levels were low and he was suffering from something that made him lethargic? What was he suffering from?
Options:
- sobering
- conversation
- anxiety
- depression
- anger
 What is the step-by-step reasoning process to arrive at the answer: depression?

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
Depression makes people lethargic. Depression cause the serotonin levels to reduce.