( ( Which ( of ( the ( following substances ) ) ) ) ( ( ( is not ) ( a mineral ) ) ? ) )
(ROOT (SBARQ (WHNP (WHNP (WDT Which)) (PP (IN of) (NP (DT the) (JJ following) (NNS substances)))) (SQ (VP (VBZ is) (RB not) (NP (DT a) (NN mineral)))) (. ?)))
Which of the following substances is not a mineral?
(ROOT (S (NP (DT A) (NN mineral)) (VP (VBZ is) (VP (VBN described) (PP (IN as) (NP (NP (DT a) (JJ natural) (NN substance)) (SBAR (WHNP (WDT that)) (S (VP (VBZ makes) (PRT (RP up)) (NP (NNS rocks))))))))) (. .)))