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: Unknown
Object permanence in a child is seen after: 
Select and explain. 
A. 6 months, B. 9 months, C. 12 months, D. 15 months
A: 6 months
Answer: A: 6 months 
Explanation: (Refer: Nelson’s Textbook of Pediatrics, 19th edition, chapter 8th, 9th and 10th)
Milestones