  We address a long standing problem regarding topology in lattice simulations
of QCD with unimproved Wilson fermions. Earlier attempt with unimproved Wilson
fermions at \beta =5.6 to verify the suppression of topological susceptibility
with decreasing quark mass (m_q) was unable to unambiguously confirm the
suppression. We carry out systematic calculations for two degenerate flavours
at two different lattice spacings (\beta = 5.6 and 5.8). The effects of quark
mass, lattice volume and the lattice spacing on the spanning of different
topological sectors are presented. We unambiguously demonstrate the suppression
of the topological susceptibility with decreasing quark mass, expected from
chiral Ward identity and chiral perturbation theory.
