【名词&注释】
体外受精(in vitro fertilization)、卫生标准(hygienic standard)、同源人工授精(artificial insemination by husband)、异源人工授精(artificial insemination by donor)、无性生殖(asexual reproduction)
[单选题]饮用水中氟含量的卫生标准是( )
A. 0.5mg/L
B. 1.0mg/L
C. 1.5mg/L
D. 2.0mg/L
E. 5.0mg/L