Final answer:
Option (A), The lungs and kidneys are interconnected through their functions involving Blood and Qi, with the lungs providing oxygen to the blood and expelling carbon dioxide, while the kidneys filter the blood and maintain electrolyte balance.
Step-by-step explanation:
The relationship of the lungs and the kidneys involves two vital substances, which are Blood and Qi. The lungs are responsible for gas exchange, providing oxygen to the blood and expelling carbon dioxide from it.
The kidneys filter the blood to remove waste and excess substances, producing urine and playing a crucial role in maintaining fluid and electrolyte balance. Both organs are essential in the overall respiratory and urinary systems, sustaining vital body functions and homeostasis.