The answer to this question should be: coronal section
The heart is located near the lung but not near the liver. Heart location is much upper than the liver so it wasn't in the same Y plane. Heart also located on the left side, opposite of the liver on the right side which means they also located on the different axial plane. But heart and liver located in the front, which means they are in same Z plane position. That is why coronal section will be able to show them together.