challenge: According to Xu et al.'s 2023 description of Luopingosaurus, what is the phylogenetic relationship between Wumengosaurus and other pachypleurosaurids?
  
  A. Wumengosaurus is the sister taxon to the clade formed by Luopingosaurus and Honghesaurus
  B. Wumengosaurus is a direct descendant of Luopingosaurus
  C. Wumengosaurus is the basal member of the clade formed by Luopingosaurus and Honghesaurus
  D. Wumengosaurus is not related to Luopingosaurus and Honghesaurus
  Answer: 