The correct option is D milk produced during the initial few days of lactation
During pregnancy, the female mammary glands undergo differentiation and begin producing milk only towards the end of pregnancy which is known as lactation. Colostrum is the milk produced during the initial few days of lactation after the childbirth. This secretion is rich in antibodies like IgG and is designed to boost up the immunity of the newborn against all immediate pathogens. Secretion of colostrum lasts for 2-3 days post-delivery.