Systemic circulation is:

• A
  Left ventricle $\rightarrow$ Deoxygenated blood $\rightarrow$ Tissues $\rightarrow$ Oxygenated blood $\rightarrow$ Right ventricle
• B
  Right ventricle $\rightarrow$ Oxygenated blood $\rightarrow$ Tissues $\rightarrow$ Deoxygenated blood $\rightarrow$ Right auricle
• C
  Left ventricle $\rightarrow$ Deoxygenated blood $\rightarrow$ Tissues $\rightarrow$ Oxygenated blood $\rightarrow$ Right auricle
• D
  Left ventricle $\rightarrow$ Oxygenated blood $\rightarrow$ Tissues $\rightarrow$ Deoxygenated blood $\rightarrow$ Right auricle