Task: Question Answering
Input (English): Question: Which of the following statements about sphingolipids is CERTAIN: 
 Options:  <1> They may have charge, but they are not amphipathic molecules. <2> They are formed by glycerol and fatty acids. <3> They contain two esterified fatty acids. <4> The cerebrosides and ganglosides are sphingolipids. <5> Terpenes are the main sphingolipids.
Output (English): 4