Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: Your eyes do not deceive you: This is apparently a working prototype for a hoverboard that makes Back to the Future a reality. Called Slide, the board supposedly uses electromagnetism to levitate itself off the ground, and can carry a person. Slide was unveiled in a stylish video but, at the moment, further technical details are not available, leading some to question if it is real or not. The hoverboard was developed by the Tokyo branch of Lexus in Japan. It is the fourth project in their ‘Amazing in Motion’ campaign, the others being an 11ft (3.4 metres)_ tall android, a swarm of quadcopters and strobe-laden mannequins ‘dancing’ above Kuala Lumpur.The Tokyo branch of Lexus claims to have made a working hoverboardCalled Slide, it apparently uses electromagnets and liquid nitrogen to floatA promotional video reveals a skater stepping onto the boardHowever, some have questioned if it is actually real or not 
 Question:In the video a skater steps off their regular board and approaches the _ hoverboard, which has smoke pouring out of its side.

Slide