This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Genetics And Genetic Disorders, Subject name: Pediatrics
All of the following have autosomal dominant pattern of inheritance except: 
Select and explain. 
A. Huntington's chorea, B. Hemophilia A, C. Tuberosis sclerosis, D. Marfan's syndrome
B: Hemophilia A
Answer: B: Hemophilia A 
Explanation: Ans. B. Hemophilia AHemophilia A is inherited as X linked recessive. Hemophilia A and hemophilia B are inherited in an X-linked recessive pattern. The genes associated with these conditions are located on the X chromosome, which is one of the two sex chromosomes. In males (who have only one X chromosome), one altered copy of the gene in each cell is sufficient to cause the condition.* Other conditions with autosomal dominant patter of inheritance include:Von Willebrand disease, Pseudo hypoparathyroidism, Osteogenesis imperfect, Marfan syndrome, Neurofibromatosis, Hereditary non polyposis coli.