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: Pediatrics
Which one of the following is not a feature of Phenylketonuria? 
Select and explain. 
A. Severe mental retardation, B. Reduced tendon reflexes, C. Enamel hypoplasia, D. Vomiting in early infancy
B: Reduced tendon reflexes
Answer: B: Reduced tendon reflexes 
Explanation: Ans. is `b' i.e., Reduced tendon reflexesReflexes are hyperactive.