This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
[{'content': 'Combination chemotherapy is used in tuberculosis in order to reduce:? \nSelect and explain. \nA. Side effects of drugs, B. Cost of therapy, C. Dosage of drugs, D. Development of drug resistance', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Combination therapy:\nLike in the case of TB, leprosy, HIV and malaria, combination therapy with 2 effective drugs has several advantages in the treatment of VL. These are:\n\nLimiting\xa0 risk\xa0 of\xa0 development\xa0 of\xa0 drug resistance,\xa0 thereby\xa0 prolonging\xa0 the\xa0 effective life-time\xa0 of\xa0 available\xa0 medicines.\nAttaining\xa0 higher\xa0 efficacy\xa0 and\xa0 cure\xa0 rate.\nShortening of duration of therapeutic regimen; better\xa0 compliance\xa0 and\xa0 convenience.\nReduction of overall dose; lower toxicity and cost.\n\nReference: Essentials of Medical Pharmacology Seventh Edition KD\xa0TRIPATHI\xa0 page no 847', 'role': 'assistant'}]