Edible part of Banana : -

Banana is a parthenocarpic berry developing from an inferior tricarpellary ovary.
The epicarp forms the peel. The edible pulp is formed by the fleshy inner layers of the pericarp.
As per the answer key, the edible part is described as the endocarp with a less developed mesocarp.
(Many textbooks describe the edible part of banana simply as the fleshy mesocarp and endocarp.)
So, as per the answer key, the edible part of banana is the endocarp and less developed mesocarp.