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The taxon which included related species is
A.Class
B. Order
C. Family
D. Genus

Answer
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Hint: Taxonomic rank refers to the comparative level of a group of organisms (a taxon) in a taxonomic hierarchy and biological classification. Criteria of taxonomic ranks are species, genus, family, order, class, phylum, kingdom, domain, etc.

Complete answer:
Option A-Class: In biological classification, the class is referred to as a taxonomic rank or a taxonomic unit, a taxon, in that rank. The class has a distinct rank of biological classification and has its distinctive name. It is called a top-level genus (genus summum). It was first introduced by the French botanist Joseph Pitton de Tournefort in his classification of plants that appeared in his Eléments de Botanique in 1694.
Option B- Order: In biological classification, the order refers to a taxonomic rank. It is used in the classification of organisms and is recognized by the nomenclature codes. A superorder is a higher rank, added directly above order and a suborder would be a lower rank, placed beneath the order.
Option C- Family: Family is one of the eight major hierarchical taxonomic ranks. It is placed in Linnaean taxonomy. It is categorized between order and genus. A family is further divided into subfamilies, which are moderate ranks between the ranks of family and genus
Option D- Genus: A genus is a taxonomic rank employed in the biological classification of living and fossil organisms. It is also used for viruses, in biology. In the hierarchy of biological classification, the genus appears above species and below a family.
So, the correct option is D, i.e., Genus

Note: Genus includes a group of related species. They show additional characters in common in comparison to species of other genera. In other words, genera are the totals of closely related species. For example, potato and brinjal are two diverse species but both belong to the genus Solanum.