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'.
Q: Question: The -keratin consists of:
Options: <1> Two dextrorotative -propellers coiled to form a left-handed helix. <2> Two dextrorotary propellers coiled to form a left-handed helix. <3> Two levorotylar helices coiled to form a levorotatory helix. <4> Two levogiras helices coiled to form a dextrorotatory helix. <5> One helix levorotatory and one dextrorotatory coiled to form a levorotatory helix.
A:
1