(S (S (NP (NP (NNP MTR) (NP (BASENP (NN head)) (PP (IN of) (BASENP (NNS operations))))) (BASENP (NNP Choi) (NNP Tak-tsan))) (VP (VBD replied) (SBAR (IN that) (S (SBAR (RB only) (SBAR (WHNP (WP what)) (S (VP (VBZ is) (VP (VBN regarded) (PP (IN as) (BASENP (NN food)))))))) (VP (VBZ counts)))))) (PERIOD .))