Erwinaze is a medication used in the treatment of acute lymphoblastic leukemia (ALL). It contains the active ingredient Asparaginase Erwinia Chrysanthemi, which is derived from bacteria. Asparaginase works by breaking down the amino acid asparagine, which is necessary for the growth and survival of cancer cells. By depriving the cancer cells of asparagine, Erwinaze helps to inhibit their growth and ultimately kill them. Therefore, the correct answer is Asparaginase Erwinia Chrysanthemi, as it accurately represents the active ingredient in Erwinaze.