comma with 'not only X but' [conjunction]: from not only passion, but

[lincsimp]

heya
which is correct/best: "My love of chemistry comes from not only passion, but the structure of the subject which I find fascinating."

"My love of chemistry comes from not only passion but the structure of the subject which I find fascinating."

any ideas?

thank you

ps it's just an example sentence!

 

[twen]

not only. . .but also

I would say the comma is optional, but I would most likely use it.

 

[Prairiefire]

"My love of chemistry comes from not only passion, but the structure of the subject which I find fascinating."

But a comma before that 'which' is required.