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
[{'content': 'The following signs would warrant fuher evaluation of developmental status in a healthy 12 weeks old infant: \nSelect and explain. \nA. 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', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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', 'role': 'assistant'}]