  We discuss the full optical response of twisted bilayer graphene at the
neutrality point close to the magic angle within the continuum model (CM).
Firstly, we identify three different channels consistent with the underlying
$D_3$ symmetry, yielding the total, magnetic, and chiral response. Secondly, we
numerically calculate the full optical response in the immediate vicinity of
the magic angle $\theta_m$ which provides a direct mapping of the CM onto an
effective two-band model. We, further, show that the ground-state of the CM in
the immediate vicinity of $\theta_m$ is unstable towards transverse current
fluctuations, a so-called Condon instability. Thirdly, due to the large
counterflow, the acoustic plasmonic excitations with typical wave numbers have
larger energies than the optical ones and their energy density may be largely
enhanced at certain frequencies which we denominate as {\it chiral resonances}.
Finally, we discuss symmetry relations for the optical response and their
consequences for the chiral response.
