This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Larynx, Subject name: ENT
A 5-year-old boy while having dinner suddenly becomes aphonic and is brought to the causality with a complaint of respiratory distress. What should be the appropriate management 
Select and explain. 
A. Cricothyroidotomy, B. Emergency tracheostomy, C. Humidified oxygen, D. Heimlich manoeuvre
D: Heimlich manoeuvre
Answer: D: Heimlich manoeuvre 
Explanation: A large bolus of food obstructed, above the cords may make the patient totally aphonic, unable to cry for help. He may die of asphyxia unless immediate first aid measures are taken. The measures consist of pounding on the back, turning the patient upside down and following Heimlich manoeuvre. These measures should not be done if the patient is only paially obstructed, for fear of causing total obstruction. Heimlich manoeuvre: Stand behind the person and place your arms around his lower chest and give four abdominal thrusts. The residual air in the lungs may dislodge the foreign body providing some airway. Ref:PL DHINGRA textbook of EAR,NOSE & THROAT edition -7, page-367