A 50 year old diabetic patient with asymptomatic gallstone (>3 cm) will be best treated by

Prophylactic cholecystectomy should be conducted in this patient even though it is a silent gallstone with no symptoms as he is a diabetic & stone size is more than 3 cm.Such patients are at increased risk of complications from gallstones. Reference:Bailey & Love's sho practise of surgery,25 th edition,page no:1121.