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:
Iranian_languages

Context:
The term Iranian is applied to any language which descends from the ancestral Proto-Iranian language. Iranian derives from the Persian and Sanskrit origin word Arya.

Question:
Iranian languages are all said to be derived from which predecessor?

Proto-Iranian