Absorbed dose is measured in which of the following units?

Absorbed dose refers to the amount of energy deposited by ionizing radiation in a given mass of tissue. It is measured in units that quantify this energy absorption, with the Gray (Gy) being the SI unit. The gray is defined as the absorption of one joule of radiation energy by one kilogram of matter. The rad is another unit for absorbed dose, defined such that one rad is equal to 0.01 gray. Therefore, both grays and rads serve as appropriate units to describe absorbed dose, making this choice correct.

The other options refer to different concepts in radiation measurement. Millisieverts and becquerels are units of equivalent dose and radioactivity, respectively, rather than absorbed dose. Rems are a unit of equivalent dose as well, often used to express the effect of radiation on human tissues but not specifically for absorbed dose. Sieverts also relate to biological effect but are not used for absorbed dose measurement. Coulombs are units of electric charge and do not pertain to dose measurement in a biological context. Thus, the combination of grays and rads is specifically aligned with the definition of absorbed dose.