Task: Text Categorization
Input (English): Question: Which of the following statements about sphingolipids is CERTAIN: 
 Options:  <0> They may have charge, but they are not amphipathic molecules. <1> They are formed by glycerol and fatty acids. <2> They contain two esterified fatty acids. <3> The cerebrosides and ganglosides are sphingolipids. <4> Terpenes are the main sphingolipids.
Output (English): chemistry