This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
[{'content': 'Most common complication of cardiac catheterization? \nSelect and explain. \nA. Arrhythmia, B. Hypeension, C. Vascular bleeding, D. Contrast reaction', 'role': 'user'}, {'content': 'Answer: C \nExplanation: the most common complication of cardiac catherisation is vascular bleeding or hematoma formation Risks of cardiac catheterization are: Bruising. Bleeding.(vascular bleeding) Hea attack. Stroke. Damage to the aery, hea or the area where the catheter was inseed. Irregular hea rhythms (arrhythmias) Allergic reactions to the dye or medication. Kidney damage. Ref Davidson 23rd edition pg 433', 'role': 'assistant'}]