Given the task definition and input, reply with output. 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'.

Question: In the human ear:
Options: <1> The stereocilia of the sensory cells are bathed in perilymph. <2> The abutment fits over the round window. <3> The sensory cells are on the Reissner membrane. <4> The synaptan receptor cells with fibers from the eighth cranial nerve. <5> The helicotrema communicates the middle and tympanic ramps.
4