vitamin B12
... that five people have received Nobel Prizes for direct and indirect studies of vitamin B12?
... that five people have received <a href="./Nobel_Prize" id="mwBQA" rel="mw:WikiLink" title="Nobel Prize">Nobel Prizes</a> for direct and indirect studies of <b id="mwBQE"><a href="./Vitamin_B12" id="mwBQI" rel="mw:WikiLink" title="Vitamin B12">vitamin<span id="mwBQM" typeof="mw:Entity"> </span>B<sub id="mwBQQ">12</sub></a></b>?