What negative thing might someone experience if they spend time learning about a subject that is very complex and difficult?\nOptions:\n- headache\n- gain knowledge\n- elation\n- advance\n- aids
Step-by-step reasoning process below:

User
Headaches is a continuous pain in the head. Headache, a negative thing someone might experience if they spend time learning about a subject that is very complex and difficult. The answer: headache.
Assistant