A 70-year-old male presented with lumps felt in axilla. On examination, axillary lymphadenopathy was noted. Biopsy was planned with the following HPE. No RS cells were seen. Flow cytometry revealed CD15 and CD30 negative. Following the histopathological confirmation of the disease, the patient was staed on chemotherapy regimen. After few days, the patient develops dysuria and urine examination was done. Supplementation of which drug could have prevented this condition?