Given the task definition and input, reply with output. You are given a short paragraph, a question and two choices to answer from. Choose the correct answer based on the paragraph and write the answer(not the key).

Paragraph: On a hot day, an endotherm may give off more heat by increasing blood flow to the surface of the body.
 Question: When it gets cold out what happens to our blood flow? 
 Choices: A)decreases 
B)increases
decreases