This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
Which of the following is false 
Select and explain. 
A. Dilatation of the gallbladder with jaundice unlikely from gallstones, B. Dilatation of the gallbladder with jaundice is due to gallstones, C. Dilatation of a gallbladder with jaundice is due to periampullary carcinoma, D. Dilatation of gall bladder may be present in mirizzi syndrome.
B: Dilatation of the gallbladder with jaundice is due to gallstones
Answer: B: Dilatation of the gallbladder with jaundice is due to gallstones 
Explanation: Courvoisier's law states that in the presence of a palpably enlarged gallbladder which is non-tender and accompanied with mild painless jaundice, the cause is unlikely to be gallstones. Chronic gallstones usually cause fibrosis of gallbladder.