Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

[Q]: The values of strangeness assigned to various particles are based on decay systematics.
[A]: The values of strangeness assigned to various particles are based on what?


[Q]: A skeleton that consists of hard, mineralized structures located within the soft tissue of organisms is called endoskeleton.
[A]: A skeleton that consists of hard, mineralized structures located within the soft tissue of organisms is called what?


[Q]: The mars rover is the wheeled robot developed by nasa to explore the surface of mars.
[A]:
What is the wheeled robot developed by nasa to explore the surface of mars?