"And if I choose neither option?" It'ss perhaps revealing too much, but short of being rendered unconscious - he like to see them try - and bodily dragged there, Khan is not going to Sickbay. The moment they scan him, the moment they take a blood sample, they'll know. His blood can cure disease. His mind can build warships. His body can survive the crash landing of a starship.

Khan is better. And in his experience? Humans have always sought to exploit that.