premise: Ronald Reagan is a bronze sculpture depicting the American politician of the same name by Chas Fagan, installed at the United States Capitol's rotunda, in Washington, D.C., as part of the National Statuary Hall Collection. The statue was donated by the U.S. state of California in 2009, and replaced one depicting Thomas Starr King, which the state had gifted in 1931.
hypothesis: The statue of Thomas Starr King was made of bronze.
reason: The context makes no mention of what the Thomas Starr King statue is made out of, only the Ronald Reagan one. It may or may not be. It could be that the system assumed it was of the same material, even though it's not explicitly stated.