This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Surgery
[{'content': 'Which of the following statement is true about external haemorrhoids? \nSelect and explain. \nA. Painful, below the dentate line, B. Painless, above the denate line, C. Rubber band ligation is the treatment of choice, D. May be associated with a skin tag', 'role': 'user'}, {'content': 'Answer: A \nExplanation: It presents as a suddenonset, olive-shaped, painful blue subcutaneous swelling at the anal margin and is usually consequent upon straining at stool, coughing or lifting a heavy weight .The thrombosis is usually situated in a lateral region of the anal margin. If the patient presents within the first 48 hours the clot may be evacuated under local anaesthesia. Ref: Bailey & Love&;s Sho Practice of Surgery,E25,Page-1259', 'role': 'assistant'}]