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
Red flag sign in child development if not attained ? 
Select and explain. 
A. Vocalization at 2 months, B. Walking at 12 months, C. Single word at 12 months, D. Standing alone at 16 month
D: Standing alone at 16 month
Answer: D: Standing alone at 16 month 
Explanation: Ans. is 'd' i.e., Standing alone at l6 month Red flag sign of child developmentMilestoneAgeNo visual fixation or following by2 monthsNo vocalisation6 monthsNot siting without suppo9-10 monthsNot standing alone16 monthsNot walking alone18 monthsNot single word18 monthsLack of imaginative play3 years