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.

When was the last solar eclipse seen in pa?
1838 Sep 18 (Annular)

What's the zip code for o'fallon missouri?
63366, 63368

Who led the first overland expedition to san diego?

Juan Rodríguez Cabrillo