<prompt> The jejunal biopsy is diagnostic inAbetalipoproteinemiaGiardiasisTropical sprueCeliac sprue  <response>: Abetalipoproteinemia is characterized by a normal mucosal appearance except for the presence of mucosal absorptive cellsthat contain lipid postprandially and disappear after a prolonged period of either fat-free intake or fasting.Ref: Harrison; 19th edition; Page no: 1939 