This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Genetics, Subject name: Pathology
Which of the following is an X-linked dominant disorder? 
Select and explain. 
A. Vitamin D resistant rickets, B. Familial hypercholesterolemia, C. Red green color blindness, D. Achondroplasia
A: Vitamin D resistant rickets
Answer: A: Vitamin D resistant rickets 
Explanation: Ref: Robbins Pathology 9th ed. pg. 142Vitamin D resistant ricketsPHEX gene. X linked dominantFamilial hypercholesterolemiaAutosomal recessiveRed green colour blindnessX linked recessiveAchondroplasiaAutosomal dominant