Which of the following is not a genus?

Assertion $-A$: Carolus Linnaeus is known as the father of taxonomy.
Reason $-R$: The classification system proposed by him is still accepted today after some modifications.

Three different genera $Solanum$,$Petunia$,and $Datura$ are placed in the family:

Brinjal and potato belong to the same genus $Solanum$,but to two different species. What defines them as separate species?

Order being a higher category,is the assemblage of................. which exhibit a few similar characters.

Match Column-$I$ with Column-$II$ for the classification of the housefly and select the correct option using the codes given below:

Column-$I$	Column-$II$
$(a)$ Family	$(i)$ Diptera
$(b)$ Order	$(ii)$ Arthropoda
$(c)$ Class	$(iii)$ Muscidae
$(d)$ Phylum	$(iv)$ Insecta