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
[{'content': 'Which of the following is an X-linked dominant disorder? \nSelect and explain. \nA. Vitamin D resistant rickets, B. Familial hypercholesterolemia, C. Red green color blindness, D. Achondroplasia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ref: Robbins Pathology 9th ed. pg. 142Vitamin D resistant ricketsPHEX gene. X linked dominantFamilial hypercholesterolemiaAutosomal recessiveRed green colour blindnessX linked recessiveAchondroplasiaAutosomal dominant', 'role': 'assistant'}]