Is Spelling Aptitude a Measure of Mental Aptitude?

Sent to me by a reader:

When I was young, my intent was to go to medical school. The entrance exam included several questions that would determine eligibility. One of the questions was, “Rearrange the letters P N E S I to spell out an important part of human body that is more useful when erect.”

Those who spelled “SPINE” became doctors…

The rest ended up in Congress.