Why does Eliezer have to go to the hospital after Buchenwald is liberated?

After Buchenwald is liberated, Eliezer finds himself in a desperate physical condition, which drives him to seek medical attention. He experiences severe health issues, a consequence of malnutrition and the horrors he endured during his time in concentration camps. The correct reason for his hospitalization is that he suffers from a fever, indicative of the deep systemic effects of starvation and trauma that his body has endured.

Eliezer's condition highlights how survivors often face immediate health crises following their liberation. His fever signals a critical moment where his body reacts to the accumulated stress, malnutrition, and neglect he faced while imprisoned. This underscores the impact of the Holocaust on survivors, not only mentally but physically, requiring medical intervention to begin recovery after the ordeal.

The other options do not fully capture the primary reason for any hospital admission related to his liberation experience. Injuries, food poisoning, or collapse from exhaustion may suggest various physical struggles, yet they do not encompass the specific sickness he faced, which was a fever stemming from the aftermath of extreme deprivation.