Mr. G talks in short bursts with frequent breaths. He tells you he used to feel breathless when he was walking, but now he has been having more and more trouble breathing even when he is lying down at night. When you listened to his lungs you heard fluid in them. Could this be due to his heart failure, or is it another problem? Choose the best answer.

a. If the left side of the heart fails, it will not pump enough blood to the body, and that means less blood will reach the right side of the heart and be sent to the lungs.
b. The left side of the heart receives blood from the lungs and pumps it out to the body, so if it fails, blood will remain in the lungs.
c. The left side of the heart pumps blood to the lungs, so if it fails, circulation in the lungs will decrease.
d. The left side of the heart does not have anything to do with the lungs, but if it fails, the right side is going to fail too, and then circulation through the lungs will decrease.