<prompt> Grade I lymphedema means:Pitting edema upto the anklePitting edema upto the kneeNon - pitting edemaEdema disappearing after overnight rest  <response>: Brunners clinical classification of Lymphedema Grade Clinical features Subclinical latent Excess interstitial fluid and histological abnormalities in lymphatics and lymph nodes, no clinically apparent lymphedemaQ. I Pitting edema, largely or completely disappears on elevation and bed restQ II Non - pitting edema, does not significantly reduce upon elevationQ. III Edema associated with irreversible skin changes, i.e. fibrosis papillaeQ. 