Teacher:In this task, you will be presented with a question having multiple possible answers in Portuguese language. And you should choose a most suitable option out of "A", "B", "C", "D", and "E" based on your commonsense knowledge.
Teacher: Now, understand the problem? Solve this instance: Question: Dan adorava jogar xadrez, mas já não conseguia mais.  Ele tinha sido debilitado por quê? 
 Options: A dores de cabeça B humildade C artrite D frustração E tédio 
Student:
A