Generate a correct and concise answer for the question based on the words in the context.

Context : The Mark 10 torpedo was a torpedo put into use by the United States in 1915. 
Question : In what year did Mark 10 torpedo enter service?
1915

Context : Mary, Crown Princess of Denmark, Countess of Monpezat, R.E. (née Mary Elizabeth Donaldson; born 5 February 1972 in Hobart, Tasmania, Australia) is the wife of Frederik, Crown Prince of Denmark. 
Question : What is Mary, Crown Princess of Denmark's spouse's name?
Frederik, Crown Prince of Denmark

Context : Famulus (possibly Fabulus, Fabullus, or Amulius) was a fresco painter famous for his work in the Domus Aurea, Rome, that was commissioned by Nero. 
Question : What city is Famulus from?

Rome