Answer:
The answer is square pyramid.
Step-by-step explanation:
All of the following solid figures except a square pyramid have two bases.
The square pyramid has four side faces that are triangles. The base of square pyramid is a square and it has five vertices with eight edges.
The cube has two congruent flat bases and four flat faces. This means, we can say, there are a total of 6 flat faces in a cube.
The pentagonal prism has also two bases. And the cylinder also has 2 bases.