In this task, you're given an open-domain question. Your task is to provide an answer to the given question. There is only one unique answer for each question. Your answer should be short, and refer to an entity, date, number, etc. Do not put your answer in the context of a sentence.

Who plays miss kate in the next step?
Bree Wasylenko

Journal of optics a pure and applied optics abbreviation?
J. Opt.

First european known to have crossed the mississippi river (2 wds.)?

Herman de Soto