The given figure shows the diagrammatic represtation of exchange of gases at the alveolus and the body tissues with blood and trasport of oxygen and carbon dioxide. Identify the blood vessles A to D.

Options

A. `{:("A",B,C,D),("Systemic vein","Pulmonary artery","Pulmonary vein","Systemic artery"):}`
B. `{:("A",B,C,D),("Systemic artery","Pulmonary artery","Pulmonary vein","Systemic vein"):}`
C. `{:("A",B,C,D),("Pulmonary artery","Systemic vein","Pulmonary vein","Systemic vein"):}`
D. `{:("A",B,C,D),("Systemic vein","Pulmonary vein","Pulmonary artery","Systemic artery"):}`

Answer

A