TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: Simple carbohydrates can be classified in terms of chain length.

SOLUTION: Which carbohydrates can be classified in terms of chain length?

PROBLEM: Lead sulfate is the white solid that forms on corroded battery terminals.

SOLUTION: What is the white solid that forms on corroded battery terminals?

PROBLEM: A skeleton that consists of hard, mineralized structures located within the soft tissue of organisms is called endoskeleton.

SOLUTION:
A skeleton that consists of hard, mineralized structures located within the soft tissue of organisms is called what?