Question: "Phantom" was a musical released in 1991, and its writer also created a 1990 tv miniseries with a similar storyline, both of which were based on a 1910 novel.  During the fifth season of the Polish TV show "Jak oni śpiewają", Damian Aleksander and Edyta Krzemień were guest performers where they sang a song whose title is the same as the title of that same 1910 novel.  Who is the author of this novel?
answer: Gaston Leroux