Task: Question Answering
Input (English): Passage: Heathrow Airport -- Heathrow Airport (also known as London Heathrow) (IATA: LHR, ICAO: EGLL) is a major international airport in London, United Kingdom. Heathrow is the second busiest airport in the world by international passenger traffic, as well as the busiest airport in Europe by passenger traffic, and the seventh busiest airport in the world by total passenger traffic. It is one of six international airports serving Greater London. In 2017, it handled a record 78.0 million passengers, a 3.1% increase from 2016.
Question: is london heathrow the busiest airport in the world
Output (English): 0