You are presented with the quiz "When the seasons change from the summer to the fall, symptoms of what will sometimes worsen?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "when the seasons change from the summer to the fall , the amount of daylight will decrease" and "symptoms of their depressive illness are worsened by decreased daylight". 

So, what's the best answer to the question?


 

        depressive illnesses   