<prompt> Features of intestinal obstruction : clinicallyinvestigation by :a Abdominal distensionb Vomitingc Fluid level in X-ray 4d Localized tendernesse Diarrheaacaadab  <response>: About option c 5 air-fluid levels in x-ray abdomen suggest intestinal obstructionGraingers Diagnostic radiology writes - 3 to 5 fluid levels less than 2.5 cm in length may be seen, particularly in the right lower quadrant, without any evidence of intestinal obstruction or paralytic ileus. 