Final answer:
Ben Carson withdrew his medical school applications at various institutions due to receiving a favorable offer from the University of Michigan Medical School after excelling in a National Medical Board exam.
Step-by-step explanation:
In Gifted Hands: The Ben Carson Story, Ben Carson withdrew his applications to medical school programs at Johns Hopkins, Yale, Michigan State, and Wayne State because he received an offer to attend the University of Michigan Medical School.
This opportunity presented itself after he performed exceptionally well on a National Medical Board exam. Consequently, Carson felt that the University of Michigan would be the best fit for him and decided to focus his attention and resources there.