What is 'dorugh-e sizdah', practised on the thirteenth day of the new year?

• A Fasting until sunset
• B Burning the old year's calendar
• C Telling fortunes with mirrors
• D Playing April-Fools-style pranks and harmless lies ✓

The 'lie of the thirteenth' is Iran's counterpart to April Fools' Day, predating it by centuries.