Read the following context and choose the best option to answer the question.
Context: I did n't think it could ve been that cause my fever got up to 104 and I felt like death but I guess that 's what it is . all they told me to do is take motrin for the pain cause I guess it 's gon na get pretty bad . I need some potassium cause I guess my potassium count is really low , and I do n't want to go through that again . I always get sick at the worst times , I swear .
Question: What may be the reason for the high fever ?
Options: 
- A virus .
 - None of the above choices .
 - The environment .
 - The stress .


A virus .