Read the following context and choose the best option to answer the question.
Context: Just a quick update to let you know that Mark is back home safe and sound , however VERY ill . I just took his temperature and it was 102.9 . He 's upstairs in bed and shivering with chills . He 's coughing and groaning .
Question: What may be wrong with Mark ?
Options: 
- He has a headache .
 - None of the above choices .
 - He has cancer .
 - He has the flu .


He has the flu .