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: What will happen to Jim's muscle strength if he exercises more then he has in the past? 
 Option1: his muscles will become stronger 
 Option2: his muscles will become weaker 
 Explanation: Aerobic exercise increases the size and strength of muscles in the heart and helps all your muscles develop greater endurance.
answer:
his muscles will become stronger


question:
Question: As the train approached the intersection and blew its horn, expanding the wavelengths of the sound, did the frequency of the horn 
 Option1: increase 
 Option2: decrease? 
 Explanation: This means that as wavelengths get shorter, more waves move past a particular spot in the same amount of time.
answer:
decrease?


question:
Question: If Jim's blood contains less water, the darkness of his blood will be 
 Option1: decreased 
 Option2: increased 
 Explanation: If the kidneys remove less water from the blood, the blood will look darker, because there is less water in it.
answer:

increased