Task: Question Answering
Input (English): Context: The Lophotrochozoa ("crest/wheel animals") are a major grouping of protostome animals. The taxon was discovered based on molecular data. Molecular evidence such as a result of studies of the evolution of small-subunit ribosomal RNA (rRNA) supports the monophyly of the phyla listed in the infobox shown at right., Protostomia (from Greek - "proto-" "first" and  "stoma" "mouth") are a clade of animals. Together with the deuterostomes and xenacoelomorpha, they make up the Bilateria, mostly comprising animals with bilateral symmetry and three germ layers. The major distinctions between deuterostomes and protostomes are found in embryonic development: most (but, confusingly, not all) protostomes undergo Protostomy, whereas most deuterostomes undergo Deuterostomy., The Spiralia are a morphologically diverse clade of animals , including within their number of molluscs , annelids , platyhelminths and other phyla . The Spiralian clade of animals are more commonly referred to as the Lophotrochozoa , although whether these two terms are equivalent is debated , as noted further below . More uncontroversially , the term Spiralia is applied to those phyla that exhibit canonical spiralian cleavage . Spiral cleavage , from which this group draws its name , is a pattern of early development found in most ( but not all ) members of the Lophotrochozoa ., Subject: spiralia, Relation: parent_taxon, Options: (A) bilateria (B) lophotrochozoa (C) phyla (D) xenacoelomorpha
Output (English): bilateria