Which fruit is a type of true nut?

کون سا پھل ایک قسم کا سچا نٹ ہے؟

Cashew nut

Ground nut

Walnut

None of these

A true nut is a dry, indehiscent fruit with a hard shell that does not split open at maturity.

Walnut fits this definition.

While cashew and groundnut are not true nuts.