TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: Phospholipids are vesicles made of.

SOLUTION: What are vesicles made of?

PROBLEM: Water leaves ponds and lakes through evaporation and also as outflow.

SOLUTION: Water leaves ponds and lakes through evaporation and also as what?

PROBLEM: When the helium is gone, the stars become white dwarfs.

SOLUTION:
When the helium is gone, the stars become what?