Which composer's 1936 opera 'Lady Macbeth of the Mtsensk District' was denounced in the newspaper Pravda as 'muddle instead of music', effectively ending his career as a dramatic composer?

• A Sergei Prokofiev
• B Nikolai Myaskovsky
• C Dmitri Shostakovich ✓
• D Vissarion Shebalin

The anonymous Pravda editorial 'Muddle Instead of Music' condemned Shostakovich's opera on Stalin's personal orders; the composer withdrew his Fourth Symphony and turned to more conservative idioms.