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.
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Question: Question: Jan had a very low heart rate, but was perfectly healthy, indicating that her heart expels blood in amounts that are 
 Option1: greater 
 Option2: lesser 
 Explanation: When the heart expels more blood with each stroke, the heart has to beat less often in order to maintain the same volume of blood flow.

Answer: greater


Question: Question: As the injection was given and the blood vessels expanded, Dean's blood moved through 
 Option1: in smaller amounts 
 Option2: in greater amounts 
 Explanation: Increasing the diameter of the blood vessels increases the amount of blood and heat that moves near the skins surface.

Answer: in greater amounts


Question: Question: If Jim wants to lower the pH of his solution he should do what to the concentration of hydrogen ions inside of it? 
 Option1: decrease 
 Option2: increase 
 Explanation: With a higher the concentration of hydrogen ions, a solution is more acidic and has a lower pH.

Answer:
increase