The conclusion can be drawn if red colour is obtained during Lassaigne's test.
Presence of S
Presence of N
Neither A nor B
Both A & B
As we learnt
Detection of S and N both -
It result in the formation of NaSCN.
- wherein
It gives blood red colour and no prission blue .
Red colour during Lassaigne's test appears due to the formation of NaSCN, so it can be concluded that both N & S are present in the organic compound