This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: ECG and Arrhythmia 3, Subject name: Medicine
[{'content': 'What does the ECG show? \nSelect and explain. \nA. Mobitz type 1 hea block, B. First degree hea block, C. Complete hea block, D. Mobitz type II hea block', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Mobitz-I Hea block In ECG dropped beat is present Before & after of dropped beat PR interval are unequal.', 'role': 'assistant'}]