单项选择题

A.(尿IgG/血TF./(尿Tf/血IgG)
B.(尿IgG/血IgG)/(尿Tf/血TF.
C.(血IgG/尿IgG)/(血Tf/尿TF.
D.(尿Tf/尿IgG)/(血Tf/血IgG)
E.(尿IgG/血IgG)/(血Tf/尿TF.