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: Surgery
[{'content': 'The following are true of haemorrhoids except ? \nSelect and explain. \nA. They are aeriolar dilatations, B. They are common causes of painless bleeding, C. They cannot be per rectally palpated, D. They can be banded', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., They are aeriolar dilatations", 'role': 'assistant'}]