NOT a X-linked dominant condition among the following is: (A) Familial hypophosphatemic rickets, (B) Rett syndrome, (C) Fragile X syndrome, (D) Duchenne's muscular dystrophy
Answer is D. X - linked dominant disorders are

Familial Hypophosphatemic rickets
Rett syndrome
Fragile X syndrome
Alport syndrome
Charcot Marie Tooth disease.