Answer to Love Story
Correct answer is D, the location of the pulmonary veins returning blood from the lungs back to the left atrium. In most cases, heart problems cause pulmonary edema. If the problem arises acutely and is due to a heart condition, then it would be known as cardiogenic pulmonary edema.
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Answer to this question is based on material presented in lectures 10 of the Thorax Lecture Series.