This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
A baby can follow an object till 180 degrees, can hold neck, can sit without suppo .The age of the baby is? 
Select and explain. 
A. 1 month, B. 3 months, C. 5 months, D. 6 months
D: 6 months
Answer: D: 6 months 
Explanation: Following an object upto 180 degrees- 2 months Neck holding-3 months Sits without suppo ( tripod position) -6 months. So, the age of the baby is 6 months.