Assertion: Belladona belongs to family Solanaceae
Reason: It has bicarpellary syncarpous superior ovary.
Belladona is kept under solanaceae because it has bicarpellary syncarpous bilocular obliquely placed ovary with ovules on swollen placental axis showing axile placentation, persistent calyx, epipetalous androecium on gamopetalous corolla and petiole adnated to the stem or branch.