In this task, You are given an open-domain question that can be answered based on factual information. Your task is to provide \*short\* answer (in a few words only) for the given question. The short answer can be one or more entities or it can also be boolean \*yes\* or \*no\*.

who developed a useful staining method to identify bacteria
Hans Christian Gram

who holds priesthood keys in the lds church
the presidents of the quorums

who plays the part of susan in days of our lives

Eileen Davidson