'Torchwood' is a spin-off of which TV series?

'A Different World' is a spin-off of which TV series? 'The Conners' is a spin-off of which TV series? 'Family Matters' is a spin-off of which TV series? 'Benson' is a spin-off of which TV series? '1883' is a spin-off of which TV series? 'The Simpsons' is a spin-off of which TV series? 'The Originals' is a spin-off of which TV series? 'Chicago P.D.' is a spin-off of which TV series?