(S (S (BASENP (DT This)) (VP (VBZ is) (PP (IN in) (NP (BASENP (NN response)) (PP (TO to) (NP (NP (BASENP (DT a) (NN board)) (PP (IN of) (BASENP (NNS experts)))) (SBAR (WHNP (WP who)) (S (VP (VBP have) (VP (VBN been) (VP (VBG investigating) (BASENP (DT the) (NN succession) (NN issue))))))))))))) (PERIOD .))