Instructions: In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.
Input: Question: The molecules of the CD1 family (CD1a, CD1b, CD1c, CD1d and CD1e) are expressed in:
Options: <1> All the cells of the organism. <2> Only in dendritic cells. <3> Only in macrophages. <4> Only in monocytes. <5> Some thymocytes, in dendritic cells, in monocytes and macrophages.
Output:
5