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.
3