Telegex.answer_callback_query

You're seeing just the function answer_callback_query, go back to Telegex module for more information.
Link to this function

answer_callback_query(callback_query_id, optionals \\ [])

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Specs

answer_callback_query(String.t(),
  text: String.t(),
  show_alert: boolean(),
  url: String.t(),
  cache_time: integer()
) :: {:ok, boolean()} | {:error, Telegex.Model.errors()}

Use this method to send answers to callback queries sent from inline keyboards. The answer will be displayed to the user as a notification at the top of the chat screen or as an alert. On success, True is returned.