You will be given a passage, and your task is to generate a Yes/No question that is answerable based on the given passage.

Q: Frozen custard is a cold dessert similar to ice cream, but made with eggs in addition to cream and sugar. It is usually kept at a warmer temperature compared to ice cream, and typically has a denser consistency.

A: is frozen custard the same as soft serve ice cream?
****
Q: According to the theory of relativity, no information can travel faster than the speed of light in vacuum, but this does not mean that the refractive index cannot be lower than 1. The refractive index measures the phase velocity of light, which does not carry information. The phase velocity is the speed at which the crests of the wave move and can be faster than the speed of light in vacuum, and thereby give a refractive index below 1. This can occur close to resonance frequencies, for absorbing media, in plasmas, and for X-rays. In the X-ray regime the refractive indices are lower than but very close to 1 (exceptions close to some resonance frequencies). As an example, water has a refractive index of 6999999999740000000♠0.99999974 = 1 − 6993260000000000000♠2.6×10 for X-ray radiation at a photon energy of 6985480652946099999♠30 keV (0.04 nm wavelength).

A: can a refractive index be less than 1?
****
Q: The seventh season of the American ABC fantasy-drama Once Upon a Time was ordered on May 11, 2017. It will consist of 22 episodes, airing on Fridays, having premiered on October 6, 2017.

A:
are they making a season seven of once upon a time?
****
