NBME 16 the inhaled glue question

Hello, I am trying to find the explanation for one question on the nbme but I cannot. Here it is: 14-year old boy has headaches for 2 months. Headaches are described as a bilateral aching in the temples. His mother says that "he has not been himself" for the last few months. He seems more confused, often foretting names, dates and places and he is clumsy with frequent falls. His school performance also has decline over the past quarter. Physical shows a broad-based ataxic gait. He is... NBME 16 the inhaled glue question
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