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)))))))))))))) (. .)))
We can work out which is the cause and which is the effect.
( We ( ( can ( ( work out ) ( ( ( which ( is ( the cause ) ) ) and ) ( which ( is ( the effect ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP We)) (VP (MD can) (VP (VB work) (PRT (RP out)) (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)))))))) (. .)))