39.
なんだね斎藤先生…
何か用かね
なんだ/なのだ: “it is assuredly that”, “can say with confidence that”;
Here, I think he’s saying this in the sense of:
“Spit it out, stop beating around the bush”
何か【なにか】something;
用か【よう】purpose;
“What is it, doctor Saitou, what do you want/what is your purpose?”