Which of the following is a process of pharmacokinetics?

Pharmacokinetics refers to the processes that determine the fate of a drug within the body, which includes how the drug is absorbed, distributed, metabolized, and eliminated. Absorption is the first step in this process and involves the movement of a drug from its site of administration into the bloodstream. Understanding absorption is crucial because it affects how quickly and effectively the drug reaches its target site, ultimately influencing its efficacy.

The other options relate to different aspects of pharmacology or medicine but do not pertain directly to pharmacokinetics. An allergic reaction, for example, is an immune response to a substance, which does not describe the processes of drug kinetics. Infection refers to a pathological state caused by microorganisms and is also unrelated to the pharmacokinetic processes. Inhibition, while it can relate to enzyme activity or drug interactions, does not directly represent a pharmacokinetic process like absorption does. Hence, absorption is the correct answer as it is a fundamental component of pharmacokinetics.