The Overeating Society

The Overeating Society meets on their annual day of consumption, Thanksgiving Day, to eat, drink, be merry, and select a new president. The goal is to eat as much turkey and ham as possible, all the trimmings, and then finish off a pie or three with each member sampling each pie. Cleary, cardiologist have a field day lecturing at society members meetings to change their ways, but to no avail. Advice to eat less is difficult to digest, and leaves a bad taste in members’ mouths. Then, there is always the newly elected President’s re-tort, I’ll have chocolate and vanilla ice cream with mine, and please make it a double. As laughter immediately erupts, one of the members begins to choke. He begins to gasp for air, but no sound escapes from his mouth and he pounds the table with his fist. The lecturing cardiologist springs into action and begins to perform the Heimlich maneuver, but his arms are not long enough to reach around the member so he can forcibly eject the obstruction. Patient is driven to ED where the obstruction is manually removed from his trachea via a tracheotomy. The obstruction had worked its way into the tracheal bifurcation by the time the Society member reached the ED. In the image, at what level is the tracheal bifurcation?

The trachea bifurcation is indicated by which numbered level