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:
In 1968, Schwarzenegger and fellow bodybuilder Franco Columbu started a bricklaying business. The business flourished thanks to the pair's marketing savvy and an increased demand following the 1971 San Fernando earthquake. Schwarzenegger and Columbu used profits from their bricklaying venture to start a mail order business, selling bodybuilding and fitness-related equipment and instructional tapes.

Question:
With which of his friends did Schwarzenegger start a bricklaying company?

Franco Columbu