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: Radiology
Extent of cardiotoxicity of chemotherapy and radiotherapy is best diagnosed by: 
Select and explain. 
A. Echocardiogram, B. Radionuclide scan, C. ECG, D. Endomyocardial biopsy
D: Endomyocardial biopsy
Answer: D: Endomyocardial biopsy 
Explanation: Ans. Endomyocardial biopsy