The best method to improve the genetic quality of mankind is

Options

A. Marriage restrictions
B. Sterilizations
C. Control of immigrations
D. Sexual separation of defectives

Answer

D

Explanation

The defective person may have various sex linked disease such as night blindness, haemophilia, colour blindness and various other defects which may be regulated by dominant or recessive genes. The increase of germ plasm of the persons having such defectives trait in the population can be checked by keeping them away from the society.