Study of the drug that would be most or least appropriate to use for a specific disease is known as:

A. pharmacy
B. pharmacology
C. toxicology
D. pharmacodynamics

d
Rationale: Pharmacodynamics is the only correct choice (although it has even more defining characteristics than listed here) because of the definitions of the other choices. Pharmacy is the practice of dispensing medications that are intended to improve the health status of patients, pharmacology is the study of drugs and their actions and effects, and toxicology is the study of poisons and poisonings.