[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: