Which 15th-century iconographer painted the famous 'Trinity' icon, a landmark of medieval religious art now housed in the Tretyakov Gallery?

• A Dionisius
• B Simon Ushakov
• C Theophanes the Greek
• D Andrei Rublev ✓

Andrei Rublev's 'Trinity' (c. 1411) depicts the three angels who visited Abraham and is considered the pinnacle of Russian Orthodox icon painting.