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: What is onychomycosis ?:
Options: <1> An infection of the oral mucosa and gums of infants produced by Candida albicans. <2> A brain abscess in immunosuppressed caused by Aspergillus spp. <3> An infection of the nails by fungi dermatophytes. <4> A serious variety of acne in which fungal species also participate. <5> A lung infection caused by Pneumocystis jirovecii.
Output:
3