This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: New born infants, Subject name: Pediatrics
All the following reflexes are present at bih except _______ 
Select and explain. 
A. Rooting reflex, B. Symmetrical tonic neck reflex, C. Asymmetrical neck reflex, D. Crosses extensor reflex
B: Symmetrical tonic neck reflex
Answer: B: Symmetrical tonic neck reflex 
Explanation: The symmetrical tonic neck reflex is a primitive reflex that normally emerges during the first year of an infant&;s life and is diminished by the age of 9-10 months. It is uncommon at bih. If at all present, may be a defect of cerebral palsy Reference: GHAI Essential pediatrics, 8th edition