<prompt> All are true bout CBD stones except:Associated with GB stones in 10 casesPrimary stones are usually brownLaboratory values may be normal in one third cases of choledocholithiasisRetained stones are discovered after 2 years of cholecystectomy  <response>: Ans. d Retained stones are discovered after 2 years of cholecystectomy Recurrent stone: discovered after 2 years after Cholecystectomy Retained stone: discovered within 2 years after cholecystectomy 