Final answer:
According to the text, Dr. Benacerraf's disease mainly affected his lungs.
Step-by-step explanation:
The text states that Dr. Baruj Benacerraf's disease affects his lungs. It mentions that he studied immunology due to his breathing problem. This indicates that his respiratory system, specifically his lungs, was mainly affected by the disease.
Learn more about the effect of Dr. Benacerraf's disease on his body