retrieve subset of a jsonb object with a list of keys

Hi:

I have a jsonb columne with json object like belo
{"a": 1, "b":2, "c":3}

I'd like to get subset of the object with key list ["a","c"]
so it retruns json object of

{"a": 1, "c":3}

something like

select '{"a": 1, "b":2, "c":3}'::jsob ->'["a","c"]'

what would be the most efficient (and simplest if possible) to get the
subset with the key list?

Thanks