This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
[{'content': 'Which one of the following is NOT a feature of autosomal recessive disorder? \nSelect and explain. \nA. Wide variation in phenotype within a family, B. Males and females are equally affected, C. Parents of an affected child are heterozygous carriers, D. Display horizontal pattern in pedigrees', 'role': 'user'}, {'content': 'Answer: A \nExplanation: To have an autosomal recessive disorder, you inherit two mutated genes, one from each parent. These disorders are usually passed on by two carriers. Their health is rarely affected, but they have one mutated gene (recessive gene) and one normal gene (dominant gene) for the condition. Two carriers have a 25 percent chance of having an unaffected child with two normal genes (), a 50 percent chance of having an unaffected child who also is a carrier (middle), and a 25 percent chance of having an affected child with two recessive genes', 'role': 'assistant'}]