You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Pope_Paul_VI

Context:
Like his predecessor Pius XII, Paul VI put much emphasis on the dialogue with all nations of the world through establishing diplomatic relations. The number of foreign embassies accredited to the Vatican doubled during his pontificate. This was a reflection of a new understanding between Church and State, which had been formulated first by Pius XI and Pius XII but decreed by Vatican II. The pastoral constitution Gaudium et spes stated that the Catholic Church is not bound to any form of government and willing to cooperate with all forms. The Church maintained its right to select bishops on its own without any interference by the State.

Question:
Who did the church retain the right to elect without interference from the state in its constitutional document?

bishops