  We present our results of 12 CO(1-0) transition in the central region of NGC
4321 using the Atacama Large Millimeter and Sub-millimeter Array (ALMA). We
found an unaccounted mass of $2.3 \times 10^9 M_{\odot}$ within the central 0.7
kpc of this galaxy. The expected mass of the supermassive black hole (SMBH) in
this galaxy is much smaller than the unaccounted mass. The invisible mass is
likely caused by dark matter in the central region of the galaxy, indicating a
cuspy dark matter profile. We also investigated the Modified Newtonian Dynamics
(MOND) as an alternative mechanism to explain the invisible mass. We noted that
at the radius of 0.7 kpc of the galaxy, the acceleration is about $1.04 \times
10^-7~cm~s^-2$, which is much larger than the critical acceleration $a_{0} \sim
1.2 \times 10^-8 ~cm~s^-2$ in the MOND theory, suggesting that theory might not
be able explain the unseen mass problem in central region of this galaxy.
