A 42-year-old auto mechanic has been diagnosed with end-stage renal<br/>disease. His twin brother is HLA identical at all MHC loci and<br/>volunteers to donate a kidney to his brother. What type of graft<br/>transplant terminology is correct in this situation?( ) A: Allograft B: Autograft C: Heterograft D: Isograft E: Xenograft