You knew the emerald option on a egg .
(ROOT_0 (S_0 (ATS_3 (NP_1 (PRP_0 You)) (VP_4 (VBD_0 knew) (NP_3 (NP_6 (ATNP_1 (DT_0 the) (JJ_1 emerald)) (NN_1 option)) (PP_0 (IN_0 on) (NP_5 (DT_0 a) (NN_2 egg)))))) (DOT_0 .)))