Question: What day did the company that built The Rattler unveil its most popular ride?
Sentence (from "Son of Beast"): In addition to breaking the world record for speed, Son of Beast was the first wooden hypercoaster in the world with a 214 ft drop and was the second wooden coaster to feature an inversion; Flip Flap Railway was the first, but was long defunct before the ride's opening.
Relevant evidence: No