I want to know the answer to the following question:
In what century was Cafe Anglais, Cafe de Paris and Rocher de Cancale opened?
All the background I'm provided with is that "The famous Paris restaurants of the 19th century, including the Café de Paris, the Rocher de Cancale, the Café Anglais, Maison Dorée and the Café Riche, were mostly located near the theatres on the Boulevard des Italiens; they were immortalised in the novels of Balzac and Émile Zola.". Is that enough to answer the question?