Smart MBAs

A bunch of smart MBA students about to give their final paper just got   nicely drunk & did not study. 

Next day morning remorse filled them &   they thought of a brilliant idea of fooling their dean to cover their   absence.  They painted their hands & dresses with oil & grease &, with  disheveled hair, they burst in the examination hall where the paper  was   going  on. 

They painted a sob story of how their car developed a flat tyre  the   previous night on a desolate road & how they didn't get any help &   had to rough out back to the campus which they reached just a few  minutes   earlier. They pleaded for a re-exam after a few days.  The dean said he was a reasonable man & he would give the reexam  after three days. 

The boys worked hard for the three days & went to the   hall confidently. The dean explained that since this was an  extraordinary   request, the four students will give the examination from four  different halls, the question paper being the same. The question paper was given to the four halls. It had 100 marks.  

The first question which had just 5 marks was simple.  The second question which had 95 marks was:- "WHICH TYRE?"