Evergreen hits like 'Soltan-e Ghalbha' and 'Gol-e Sangam' date from which era of Iranian music?

• A The Qajar court era
• B The pre-revolution pop golden age ✓
• C The 1990s underground
• D The post-2000 rap wave

The 1960s–70s produced the classic songbook Iranians still sing at every gathering.