Final answer:
La Scala is a famous Italian opera house in Milan and the answer to the second part of the question is A) A famous Italian opera house; P and G were the first performers.
Step-by-step explanation:
La Scala is the name of a famous Italian opera house located in Milan. It is considered one of the most prestigious opera houses in the world and has a long history of hosting some of the greatest opera performances. The answer to the second part of your question is A) A famous Italian opera house; P and G were the first performers. La Scala has seen numerous legendary performers throughout its existence, but there isn't a specific P and G mentioned in the context of your question.