X-linked recessive disorder with mental retardation and self mutilation is seen in -: (A) Lesch - Nyhan syndrome, (B) Fragile X - syndrome, (C) Down syndrome, (D) All of the above
Answer is A. X-linked recessive disorder causing MR :- Lesch - Nyhan syndrome, Hunter's syndrome.
Self-mutilation behavior is seen in Lesch - Nyhan syndrome.