[单选题]
成熟乳是指
A.妊娠晚期分泌的乳汁
B.产后前3天分泌的乳汁
C.产后3天以后分泌的乳汁
D.产后1周以后分泌的乳汁
E.产后2周以后分泌的乳汁
参考答案与解析: