This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Unknown
[{'content': '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: Ans. (a) Vitamin D resistant ricketsRef: Robbins pathology 9th ed. /142Vitamin D resistant ricketsPHEX gene. X linked dominantFamilial hypercholesterolemiaautosomal dominantRed-green color blindnessX linked recessiveAchondroplasiaAutosomal dominantPlease refer to the explanation of more details.', 'role': 'assistant'}]