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
All of following are true regarding recurrent pyogenic cholangitis except 
Select and explain. 
A. Equal incidence in males and females, B. More common in left lobe of liver, C. All are pigmented stones, D. GB stones are present in >50% cases
D: GB stones are present in >50% cases
Answer: D: GB stones are present in >50% cases 
Explanation: Recurrent pyogenic cholangitis Infection is caused by bacterial contamination usually biliary pathogens, and biliary parasites, such as clonorchis sinensis, opisthorchis viverrini and Ascaris lumbricoides Paial obstruction of biliary tree caused by biliary sludge and dead bacterial cell bodies, which form brown pigment stones. Clinical features Patients present with frequent episodes of pain, fever and jaundice Biliary strictures and repeated episodes of cholangitis are the common, may lead to liver abscess and cirrhosis GB stones are present in <50% cases Ref: Sabiston 20th edition. Pgno :1507-1508