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: Surgery
a 16-week old child which is expected 
Select and explain. 
A. Make polysyllabic vowel sounds, B. Get excited at sight of food, C. Enjoy mirror, D. All of the above
B: Get excited at sight of food
Answer: B: Get excited at sight of food 
Explanation: Milestones of development at 16 weeks * Social: Laughs out loud; may show displeasure if social contact is broken; excited at sight of food. * Prone: Lifts head and chest, head in approximately veical axis; legs extended. * Supine: Symmetric posture predominates, hands in midline; reaches and grasps objects and brings them to mouth. * Standing: When held erect, pushes with feet. * Sitting: No head lag on pull to sitting position; head steady tipped forward; enjoys sitting with full truncal suppo. * Adaptive: Sees pellet, but makes no move to it.