Bell nonlocality and the reality of the quantum wave function

The status of the quantum wave function is one most debated issues in foundations---whether it corresponds directly to reality or just represents knowledge information about some aspect reality. We propose a $\ensuremath{\psi}$-ontology theorem that excludes class ontological explanations where treated as mere information. Our result, unlike acclaimed Pusey-Barrett-Rudolph's theorem, does not presume absence holistic properties for product preparations. At core our derivation, we utilize seminal no-go result by Bell rules out any local realistic world view theory. show observed phenomenon nonlocality cannot be incorporated $\ensuremath{\psi}$-epistemic models. Using well-known Clauser-Horne-Shimony-Holt inequality, obtain threshold bound on degree epistemicity above which models are compatible with statistics.