  A candidate for the charmonium(like) state X(3872) is found 11 +/- 7 MeV
below the DD* threshold using dynamical Nf=2 lattice simulation with J^PC=1^++
and I=0. This is the first lattice simulation that establishes a candidate for
X(3872) in addition to the nearby scattering states D D* and J/psi omega, which
inevitably have to be present in dynamical QCD. We extract large and negative
DD* scattering length a_0=-1.7 +/- 0.4 fm and the effective range r_0=0.5 +/-
0.1 fm, but their reliable determination will have to wait for a simulation on
a larger volume. In I=1 channel, only the D D* and J/psi rho scattering states
are found and no candidate for X(3872). This is in agreement with the
interpretation that X(3872) is dominantly I=0, while its small I=1 component
arises solely from the isospin breaking and is therefore absent in our
simulation with m_u=m_d.
