During withdrawal from a depressant like alcohol, the user is likely to experience depression. Depressants suppress the production of neurotransmitters. So, when you stops using depressants, your brain would rebound which would result to the production of excess adrenaline causing withdrawal symptoms like depression, anxiety, headaches and irritability.
The answer is bioenergetics
Definition of Bioenergetics: the study of the transformation of energy in living organisms.
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The answer in A) Phlebitis because the abbreviation -itis means inflammation and phleb/o means vein.