Which pronoun correctly completes this conversation?

Juan: ¿Conoces a la maestra de historia?
Eric: Sí, yo _____ conozco.

Respuesta :

The answer for the blank space would be LA
Sada
The answer is la, so the conversation would look like this..

Juan: ¿Conoces a la maestra de historia?
Eric: Si, yo la conozco.
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