tarun001
I rejected option B as 'the former surgeon general' seems to be important to understand the meaning of sentence and hence should not be placed between the commas (which signifies non-essential additional info). Please let me know if my understanding is correct
KarishmaB AndrewN AjiteshArunWhen we say 'essential,' we mean something that removes ambiguity in the context. When we give the name of a person, it usually identifies the person uniquely so we need nothing else.
All modifiers add to the meaning of the sentence but that doesn't make them essential. 'Essential' is the one that removes ambiguity.
My brother is coming to visit me.
(Ambiguous if I have more than one brothers)
My brother Jack is coming to visit me.
Jack is an essential appositive. So no commas. Tells us which brother. Uniquely identifies the brother.
Jack is coming to visit me.
No ambiguity
Jack, my brother, is coming to visit me.
'my brother' is a non essential appositive. Adds to the sentence but is not essential.
My brother, Jack is coming to visit me.
Again, 'my brother' is the non essential appositive. Note that 'Jack' is not the appositive. There is a comma between 'my brother' and Jack but none between Jack and 'is.'
My only brother, Jack, is coming to visit me.
'Jack' is a non essential appositive now. It tells us what the name of the subject is as an aside. 'My only brother' is enough to uniquely identify him.
When we say 'Atul Gawande' in (B), ambiguity is over. If we rename him, it will be with a non essential appositive and will need commas.