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: The air gets thicker when it is 
 Option1: hot 
 Option2: cold 
 Explanation: Increasing air temperature decreases atmospheric pressure.

A: cold
****
Q: Question: When a star is nearing a planet, the star will be pulled into it if the gravitational force is 
 Option1: weaker 
 Option2: stronger 
 Explanation: The closer objects are to each other, the stronger the gravitational force between them.

A: stronger
****
Q: Question: An object with a rough surface will have _____ friction than an object with a smooth surface. 
 Option1: more 
 Option2: less 
 Explanation: Friction is greater when objects have rougher surfaces or are heavier so they press together with greater force.

A:
more
****