Exposure to Ionizing Radiation Usually Is Measured in Units of MilliSieverts

Exposure to ionizing radiation usually is measured in units of milliSieverts (mSv) . For example, one mammogram produces an exposure of 0.4 mSv. A sievert accounts for ________

A) the energy absorbed by tissue (J) .
B) the energy absorbed per kilogram of tissue (J/kg) .
C) the damage caused by the energy absorbed per kilogram of tissue (RBE $\times$ J/kg) .
D) the level of radioactivity encountered (decay events/second) .
E) the physical damage caused by one joule of absorbed energy (RBE/J) .