<prompt> Which of the following radiopharmaceutical is used in Imaging of Reticulo endothelial systemTc-99m Red blood cellsTc-99m PyrophosphateTc-99m Sulfur ColloidTc-99m Teboroxime  <response>: Tc-99m Sulfur Colloid -Imaging of RES, Gastric emptying, GI bleeds. 