Regarding hepatic encephalopathy which of the following is TRUE / FALSE? 1. The correlation between severity of liver disease and height of ammonia levels is often poor 2. Lactulose, results in colonic alkalification 3. The mainstay of treatment for encephalopathy is lactulose, an absorbable disaccharide. 4. Rifaximin at 550 mg twice daily is not very effective in treating encephalopathy 5. It is a poor prognostic sign