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:
Arnold_Schwarzenegger

Context:
He continued his winning streak in the 1971–74 competitions. In 1975, Schwarzenegger was once again in top form, and won the title for the sixth consecutive time, beating Franco Columbu. After the 1975 Mr. Olympia contest, Schwarzenegger announced his retirement from professional bodybuilding.

Question:
What was Schwarzenegger's last competition before retirement?

Mr. Olympia