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': 'Risk factors for malignant change in an asymptomatic patient with a gall bladder polyp on ultrasound include all of the following except \nSelect and explain. \nA. Age > 60 years, B. Rapid increase in size of polyp, C. Size of polyp > 5 mm, D. Associated Gall stones', 'role': 'user'}, {'content': "Answer: C \nExplanation: Gall bladder polyp more than 10 mm in size needs surgical intervention as the risk for developing malignancy is greater.Other risk factors include age>60 yrs,association with gallstones,rapid increase in size of polyp,symptomatic,sessile polyp. Reference:SRB's manual of surgery,5th edition,page no:658.", 'role': 'assistant'}]