instruction:
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.
question:
Question: Rich breathed out. When he breathes _____ his chest seems larger. 
 Option1: in 
 Option2: out 
 Explanation: Inhaling, or breathing in, increases the size of the chest, which decreases air pressure inside the lungs.
answer:
out


question:
Question: Sandra sees a tiny glacier, and notes that it has smaller tributary glaciers flowing into it, in valleys that are 
 Option1: shallow 
 Option2: deep 
 Explanation: Smaller tributary glaciers, like tributary streams, flow into the main glacier in their own shallower U-shaped valleys.
answer:
deep


question:
Question: Curt wants to make a drink from chocolate chips and milk. To make the chips melt faster, Shane will use chips that are 
 Option1: bigger 
 Option2: smaller 
 Explanation: It would be hard to get a big chunk of chocolate to dissolve in your milk or hot water. Maybe you could make hot chocolate from some smaller pieces like chocolate chips, but it is much easier to add a powder to your milk. This is because the smaller the pieces are, the more surface area they have.
answer:

smaller