<prompt> X in the graph representsTherapeutic indexTherapeutic doseTherapeutic windowTherapeutic efficacy  <response>: Therapeutic index : LD50ED50 Therapeutic window Range of steady-state concentrations of drug that provides therapeutic efficacy with minimal toxicity Therapeutic efficacy: Ability of a drug to activate a receptor and generate a clinical response is Therapeutic efficacy Therapeutic dose: Dose of a drug required to have a clinical response 