It's kind of a, which is the cause and which is the effect, question.
( It ( ( 's ( kind ( of ( ( a , ) ( which ( is ( ( ( the cause ) and ) ( which ( is ( ( ( the effect ) , ) question ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ 's) (NP (NP (NN kind)) (PP (IN of) (NP (NP (SYM a)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (NP (NP (DT the) (NN cause)) (CC and) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (NP (NP (DT the) (NN effect)) (, ,) (NP (NN question)))))))))))))) (. .)))
The question is which is the cause and which is the effect.
( ( The question ) ( ( is ( ( ( which ( is ( the cause ) ) ) and ) ( which ( is ( the effect ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN question)) (VP (VBZ is) (NP (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (NP (DT the) (NN cause))))) (CC and) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (NP (DT the) (NN effect))))))) (. .)))