<prompt> The cardinal sign of inflammation called rubor is mainly the result of:Decreased interstitial hydrostatic pressureDecreased vascular permeability of capillariesIncreased vascular permeability of venulesVasodilation of arterioles  <response>: Inflammation can be defined as the reaction of vascularized living tissue to local injury. Celsus originally described four cardinal signs of inflammation: rubor redness, tumor swelling, calor heat, and dolor pain. Virchow later added a fifth sign, loss of function functio laesa. Redness rubor and heat calor are primarily the result of increased blood flow, secondary to vasodilation of arterioles. 