Classicalla, he didn't say that your guesses were wrong. He just said you needed to ask clarifying questions rather than make two or more guesses.
1) Does #1 work for Lex Labs? Star Labs?
2) Does #1 appear in more than one episode?
3) Do any of the remaining characters appear in lots of fanfic? (For example, Henderson appears in lots of fanfic regardless of when the story is based, but Dr. Fabian Leak only appears in a few episode adaptations.)
4) Do the remaining science guys have medical backgrounds?
