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
Which is not a feature of Downs syndrome 
Select and explain. 
A. Clinodactyly, B. Pigmented bih marks, C. Hypotonia, D. Respiratory tract Infections
B: Pigmented bih marks
Answer: B: Pigmented bih marks 
Explanation: Ans. is 'b' i.e., Pigmented bih marks