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We show that if the hadronic resonance gas (HRG), with viscosity to entropyratio $\eta/s\approx$0.24, is physical at temperature $T\approx$220 MeV,charged particles $p_T$ spectra and elliptic flow in Au+Au collisions at RHIC,over a wide range of collision centrality do not distinguish between initialQGP fluid and initial hadronic resonance gas. Unambiguous identification ofbulk of the matter produced in Au+Au collisions require clear demonstrationthat HRG is unphysical at temperature $T<$200 MeV.  It calls for precise lattice simulations with realistic boundary conditions.

Charged particle's $p_T$ spectra and elliptic flow in $\sqrt{s_{NN}}$=200 GeV Au+Au collisions: QGP vs. hadronic resonance gas