Dimensional formula for calories is ..............
(a) $\mathrm{M}^{1} \mathrm{~L}^{1} \mathrm{~T}^{-2}$
(b) $\mathrm{M}^{2} \mathrm{~L}^{1} \mathrm{~T}^{-2}$
(c) $\mathrm{M}^{1} \mathrm{~L}^{2} \mathrm{~T}^{-2}$
(d) $\mathrm{M}^{2} \mathrm{~L}^{2} \mathrm{~T}^{-2}$