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
A baby has recently developed mouthing but has not developed stranger anxiety. Likes and dislikes for food. What is the most appropriate age of this baby- 
Select and explain. 
A. 3 months, B. 5 months, C. 7 months, D. 9 months
B: 5 months
Answer: B: 5 months 
Explanation: Ans. is 'b' i.e., 5 months Mouthing develops by 4 months, while stranger anxiety develops by 7 months. So, the age of this child is between 4 to 7 months. Amongst the given options best answer is 5 months.