<prompt> Which of the following drugs required a dose adjustment in patient during radiotherapy in order to present radiation toxicity ?VincristineDactinomycinCyclophosphamide6-Mercaptopurine  <response>: Ans. is b i.e., Dactinomycin o Like anthracyclines doxo and daunorubicin, dactinomycin can also cause radiation recall syndrome and the dose should be adjusted with radiotherapy. 