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 biology
( so ( it ( 's biology ) ) )
(ROOT (SBAR (IN so) (S (NP (PRP it)) (VP (VBZ 's) (NP (NN biology))))))