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: Pathology
The following are single gene disorders qexcept- 
Select and explain. 
A. Haemochromatosis, B. Cystic fibrosis, C. William's syndrome, D. Huntington's disease
C: William's syndrome
Answer: C: William's syndrome 
Explanation: Ans. is 'c' i.e., William's syndrome