TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: Three many families are known quarks divided into.

SOLUTION: How many families are known quarks divided into?

PROBLEM: The core of a star collapses during a supernova, forming a neutron star.

SOLUTION: The core of a star collapses during what event, forming a neutron star?

PROBLEM: Heat energy from the sun is transferred to earth primarily by radiation.

SOLUTION:
Heat energy from the Sun is transferred to Earth primarily by which of the following processes?