This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Medicine
[{'content': 'ECG changes that occur after administration of Digoxin includes \nSelect and explain. \nA. ST elevation, B. PR prolongation, C. QT prolongation, D. ST depression', 'role': 'user'}, {'content': 'Answer: D \nExplanation: (D) ST depression# Digoxin effects on ECG: Shows down slope ST depression with a characteristic "Salvador Dali sagging" appearance Flattened, inverted, or biphasic T waves. Shortened QT interval. Delay due to development of 1:1 A-V conduction.', 'role': 'assistant'}]