so it's sociology
( so ( it ( 's sociology ) ) )
(ROOT (SBAR (IN so) (S (NP (PRP it)) (VP (VBZ 's) (NP (NN sociology))))))
So it's social science 
( So ( it ( 's ( social science ) ) ) )
(ROOT (S (CC So) (NP (PRP it)) (VP (VBZ 's) (NP (JJ social) (NN science)))))