(B) In $Periplaneta$ $americana$ (cockroach),the mouthparts consist of a labrum (upper lip),a pair of mandibles,a pair of maxillae,and a labium (lower

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(B) In $Periplaneta$ $americana$ (cockroach),the mouthparts consist of a labrum (upper lip),a pair of mandibles,a pair of maxillae,and a labium (lower lip). There is a median flexible lobe acting as a tongue,which lies within the cavity enclosed by the mouthparts. This structure is known as the $Hypopharynx$.