Task: Question Answering
Input (English): Context: Portunoidea is a superfamily of crabs that includes the family Portunidae, the swimming crabs. Which other crab families are also placed here is a matter of some contention, and may be revised following molecular phylogenetic analyses., Cancroidea is a superfamily of crabs , comprising the families Atelecyclidae and Cancridae , and tentatively  Montezumellidae . Four other families have been separated into new superfamilies : Cheiragonidae into Cheiragonoidea , Corystidae into Corystoidea , and both Pirimelidae and Thiidae into Portunoidea ., Crabs are decapod crustaceans of the infraorder Brachyura, which typically have a very short projecting "tail" (abdomen) (= short, = tail), usually entirely hidden under the thorax. They live in all the world's oceans, in fresh water, and on land, are generally covered with a thick exoskeleton and have a single pair of claws. Many other animals with similar names  such as hermit crabs, king crabs, porcelain crabs, horseshoe crabs, and crab lice  are not true crabs., Atelecyclidae is a family of crabs belonging to the Cancroidea superfamily, and currently contains eight genera of which two are extinct. However, the genera other than "Atelecyclus" and "Pseudocorystes" do not belong in the Cancroidea, and are to be removed from the family., Cancridae is a family of crabs. It comprises six extant genera, and eleven exclusively fossil genera, in two subfamilies:
Cancrinae , Portunidae is a family of crabs which contains the swimming crabs., Subject: cancroidea, Relation: parent_taxon, Options: (A) atelecyclidae (B) brachyura (C) cancridae (D) cancroidea (E) portunidae (F) portunoidea
Output (English): brachyura