You are given a question or fill-in-the-blank question, two answer options (Option1 and Option2) and an Explanation. Your task is to find the correct answer (return the string of the correct option, not option1/2) for the given question from the given options and using explanation.

Q: Question: A hydrocarbon that halves its carbon atoms will cause an _____ in the amount of isomers. 
 Option1: decrease 
 Option2: increase 
 Explanation: As you increase the number of carbon atoms in a hydrocarbon, the number of isomers quickly increases.

A: decrease
****
Q: Question: If James is taking pictures with his camera and he decides to leave his shutter open less, what happens to the amount of light the lens lets in? 
 Option1: increases 
 Option2: decreases 
 Explanation: A camera shutter stays open longer in dim light to let more light in.

A: decreases
****
Q: Question: We sweat when it is warm because it allows us to produce 
 Option1: more heat 
 Option2: less heat 
 Explanation: For example, on a cold day, an endotherm may produce more body heat by increasing its rate of metabolism.

A:
less heat
****