This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2017, Subject name: Pharmacology
Many drugs are used as rescue therapy for preventing the adverse effects of anticancer drugs. Folinic acid is used in:- 
Select and explain. 
A. Methotrexate toxicity, B. Cisplatin toxicity, C. Doxorubicin toxicity, D. Cyclophosphamide toxicity
A: Methotrexate toxicity
Answer: A: Methotrexate toxicity 
Explanation: DHF | DHF reductase<-------- inhibited by METHOTREXATE THF/FOLINILACID/LEVCOVORIN Thereforeto treat MTX toxicity FOLINIC ACID/LEVCOVORIN is used. B: Cisplatin Vomiting d/tcisplatin :ONDANSETRON Nephrotoxicity :AMIFOSTINE C: cardiotoxicity d/t doxorubicin : DEXRAZOXANE D: hemorrhagic cystitis d/t cyclophosphamide : MESNA