Read the following statements regarding the human immune system: (A) B-lymphocytes produce an army of proteins called antibodies in response to pathogens. (B) T-cells themselves secrete antibodies to neutralize the pathogens in the blood. (C) Colostrum secreted by the mother during the initial days of lactation provides active immunity to the newborn. (D) Interferons are secreted by virus-infected cells to protect no

Step-by-step solution

Statement (A) is correct as B-lymphocytes produce an army of proteins called antibodies in our blood to fight pathogens. Statement (B) is incorrect because T-cells themselves do not secrete antibodies, but they help B-cells to produce them. Statement (C) is incorrect because colostrum contains pre-formed antibodies (IgA) and provides natural passive immunity to the newborn, not active immunity. Statement (D) is correct as virus-infected cells secrete proteins called interferons which protect non-infected cells from