The question is not properly asked. If sommelier opens a bottle, he/she must smell the cork and taste small quantity of wine to make sure that the wine is not spoiled in any way. So the question should be: Why sommelier smell the cork.
The question is not properly asked. If sommelier opens a bottle, he/she must smell the cork and taste small quantity of wine to make sure that the wine is not spoiled in any way. So the question should be: Why sommelier smell the cork.