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
The following signs would warrant fuher evaluation of developmental status in a healthy 12 weeks old infant: 
Select and explain. 
A. Dose not vocalize, B. Dose not babble, C. Dose not raise head up to 90deg, D. Dose not transfer a bright red ring from one hand to the other, even when the ring is directly placed in the hand of child
A: Dose not vocalize
Answer: A: Dose not vocalize 
Explanation: A baby with 12 weeks of age should vocalise. If not, baby should warrant further evaluation. Ref: Kligman, Behrman, Jenson, Stanton (2007), Pa II, "Growth, Development and Behavior ", In the book, "Nelson's Textbook of Pediatrics", Volume 1, 18th Edition, New Delhi, Pages 43-47