Ans. is 'a' i.e.Heimlich's maneuver The best option here is Heimlich's maneuver."Heimlich man oeuvre: 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. "Heimlich's maneuveris actually performed for laryngeal foreign bodies and not for tracheal or bronchial foreign bodies.Heimlich's is performed for completed obstruction and should not be tried in partial obstructions (for fear of causing total obstruction )If Hemlocks m fails then cricothyrotomy or emergency tracheostomy is done.Once the emergency is over, foreign body can be removed by direct laryngoscopy or by laryngofissure (if body is impacted )Tracheal & Bronchial foreign bodiesEmergency removal is not indicated in these ( unless there is airway obstruction or they are of vegetable matter eg seeds likely to swell up)Removed by bronchoscopy with full preparation and under GA.Rigid bronchoscope is used.