Which part of the fruit, labelled in the given figure make it a false fruit

The fruit is a characteristic feature of the flowering plants. It is a mature or ripened ovary, developed after fertilisation. If a fruit is formed without fertilisation of the ovary, it is called a parthenocarpic fruit.

In few species of plants, the thalamus also contributes to fruit formation, such fruits are called false fruits. The fleshy thalamus is edible in these cases. Example is Apple.