This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pharmacodynamics, Subject name: Pharmacology
[{'content': 'Therapeutic drug monitoring is used in - \nSelect and explain. \nA. Diuretic, B. Metformin, C. Levodopa, D. Digoxin', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Digoxin Therapeutic drug monitoring is particularly useful in following situations -1. Drugs with low safety margin -a) Digoxinb) Anticonvulsantsc) A ntiarryth micsd) Theophyllinee) Aminoglycoside antibioticsf) Lithiumg) Tricyclic antidepressants2. If individual variations are large - Antidepressants, Lithium3. Potentially toxic drugs used in presence of renal failure - Aminoglycoside antibiotic, vancomycin, cyclosporine4. In case of poisoning5. In case of failure of response without any apparent reason - Antimicrobials6. To check patient compliance - Psycho-pharmacological agents.o Drugs whose response is easily measurable eg. hvpoglycaemics (metformin), antihypertensive, diuretics, oral anticoagulants and general anaesthetics, monitoring of plasma cone, is of no value.", 'role': 'assistant'}]