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'Eso' or 'esto' are neuter demonstrative pronouns, used when an idea or some abstract thing is being talked about OR when asking what something is (the gender not being known).
When you're asking what something is, the response will not contain 'eso' or 'esto', because adequate wording that expresses the gender will be used.
¿Qué es eso/esto? = What is that/this (I don't know the word for it)?
- (Ese) es un/(Esa) es una/(Este) es un/(Esta) es una .... (the demonstrative pronoun doesn't need to be included in the response)
You don't need the accent mark on 'éste', by the way. The demonstrative pronouns used to have an accent mark, but no longer do.
Using 'esté' or 'está' would be incorrect, as these are not demonstrative pronouns; they're conjugations of the verb 'estar'.
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