Given a scientific question, generate a correct answer to it.

[EX Q]: In atherosclerosis, thickening of an arterial wall due to this can restrict blood flow through the artery?
[EX A]: plaque formation

[EX Q]: What temperature scale is obtained by adding 273 degrees from the corresponding celsius temperature?
[EX A]: kelvin scale

[EX Q]: What is the name of the process where light is produced without heat?
[EX A]:
luminescence