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
Which of the following drugs required a dose adjustment in patient during radiotherapy in order to present radiation toxicity ? 
Select and explain. 
A. Vincristine, B. Dactinomycin, C. Cyclophosphamide, D. 6-Mercaptopurine
B: Dactinomycin
Answer: B: Dactinomycin 
Explanation: 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.