Which of the following characteristics best describes Lewis antibodies? a. IgM, naturally occurring, cause HDFN b. IgM, naturally occurring, do not cause HDFN c. IgG, in vitro hemolysis, cause...

Which of the following characteristics best describes Lewis antibodies?

a. IgM, naturally occurring, cause HDFN

b. IgM, naturally occurring, do not cause HDFN

c. IgG, in vitro hemolysis, cause hemolytic transfusion reactions

d. IgG, in vitro hemolysis, do not cause hemolytic transfusion reactions