How is the effective dose calculated from organ doses?

How is the effective dose calculated from organ doses?

• A. E = ∑ w_T H_T, where H_T is the equivalent dose to tissue T and w_T is the tissue weighting factor.
• B. E equals the maximum organ dose among all tissues.
• C. E is the simple sum of absorbed doses without weighting factors.
• D. E is determined by the total energy deposited in the body divided by body mass.

Answer: (A)