Category among following is
a)	Species	b)	Malvaccae	c)	Thalmiflorae	d)	Dicotyledonae

(a)

Linnaeus introduced five categories in the taxonomic hierarchy, i.e., class, order, species and variety. Later on, three more categories, i.e., kingdom, division or phylum and family were added and variety was discarded to make a hierarchy of seven obligate categories.