Task: Explanation
Input (English): The String Quartet No. 3 in E-flat minor, Op. 30, by Pyotr Ilyich Tchaikovsky, was composed in 1876, and is the last of his three String Quartets. It was written as a memorial for Ferdinand Laub. (The date upon the manuscript is early February 1876.) Question: The composer of The String Quartet No. 3 in E-flat minor was awarded a lifetime pension by what emperor? Answer: Emperor Alexander III
Output (English): The String Quartet No. 3 in Eflat minor, Op. 30, by Pyotr Ilyich Tchaikovsky, was composed in 1876, and is the last of his three String Quartets.