Question: What flag does the Swiss born Formula One driver who competed in the 2015 season for Lotus race under?
Sentence (from "Birabongse Bhanudej"): Prince Birabongse Bhanudej Bhanubandh or Phra Chao Worawong Ther Phra Ong Chao Birabongse Bhunudej Thai: พระเจ้าวรวงศ์เธอ พระองค์เจ้าพีรพงศ์ภาณุเดช (born 15 July 191423 December 1985), better known as Prince Bira of Siam (now Thailand) or by his "nom de course" B. Bira, was the first and remains the only Thai to drive in Formula One.
Relevant evidence: No