Which of the following is not a function of kidneys?

A

Regulation of blood pressure

B

Removal of urea

C

Regulation of acidity of fluids

D

Secretion of antibiotics

Dear student 

Urine formation and the excretion of wastes is one of the primary functions of the kidneys. The kidneys also help to maintain blood composition, pH and osmolarity, and regulate blood volume, blood pressure and red blood cell production through hormonal mechanisms.
 Antibiotics are the proteins which are released in response to an antigen. It is a prominent protein which is used for the defensive mechanism.
So, the correct answer is option D.

ANSWER
The kidneys are important organs with many functions in the body, including producing hormones, absorbing minerals, and filtering blood and producing urine. Antibiotics are the proteins which are released in response to an antigen. It is a prominent protein which is used for the defensive mechanism.
So, the correct answer is option D.