This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Newborn Infant - Physical Examination, Subject name: Pediatrics
Which response is not seen in newborns as a measure of thermogenesis? 
Select and explain. 
A. Shivering, B. Breakdown of brown fat, C. Universal flexion, D. Cutaneous vasoconstrictions
A: Shivering
Answer: A: Shivering 
Explanation: ANSWER: (A) ShiveringREF: O.P Ghai 6th ed p. 151,152"Newborn cannot produce heat by shivering"Mechanisms for thermogenesis in new born are mainly due to rapid increase in circulating catecholamines due to cold stressLipolysis and re-esterification of brown fatPeripheral vasoconstrictionIncrease heart rate