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: Anatomy
Risk factors for malignant change in an asymptomatic patient with a gallbladder polyp on ultrasound include all of the following except 
Select and explain. 
A. Age >60 years, B. Rapid increase in size of polyp, C. Size of polyp >5mm, D. Associated gallstones
C: Size of polyp >5mm
Answer: C: Size of polyp >5mm 
Explanation: Risk factors for carcinoma Gallbladder Gallstones >3cm Procelain gallbladder Anomalous pancreaticobiliary junction Choledochal cysts Adenomatous polyps Primary sclerosing cholangitis Obesity Salmonella typhi infection Ref: Sabiston 20th edition Pgno : 1512