13. Right part of the human heart contains

a) Oxygenated blood b) Mixed blood c) Deoxygenated blood d) No blood

The superior venacava brings deoxygenated blood from the upper body to the right atrium of the heart and the inferior venacava brings deoxygenated blood from the lower body to the right atrium of the heart.
 
So the right option is c) Deoxygenated