Which polypeptide of cholera enterotoxin is nontoxic but immunogenic?

Which polypeptide of cholera enterotoxin is nontoxic but immunogenic? Correct Answer B

Cholera enterotoxin (produced by Vibrio cholerae) consists of three polypeptides: A1, A2 and B polypeptides. The A polypeptides are toxic, while the B polypeptide is nontoxic but immunogenic. Thus, we can use the B polypeptide for the manufacture of vaccines.
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Staphylococcal Enterotoxin
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There is a time in every man's education when he arrives at the conviction that envy is ignorance; that imitation is suicide; that he must take himself for better, forworse, as his portion; that though the wide universe is full of good, no kernel of nourishing corn can come to him but through his toil bestowed on that plot of groundwhich is given to him to till. The power which resides in him is new in nature, and none but he knows what that is which he can do, nor does he know until he hastried. Not for nothing one face, one character, one fact, makes much impression on him, and another none. This sculpture in the memory is not without pre-established harmony. The eye was placed where one ray should fall, that it might testify of that particular ray. We but half express ourselves, and are ashamed ofthat divine idea which each of us represents. It may be safely trusted as proportionate and of good issues, so it be faithfully imparted, but God will not have his workmade manifest by cowards. A man is relieved and gay when he has put his heart into his work and has done his best; but what he has said or done otherwise, shallgive him no peace. It is a deliverance which does not deliver. In the attempt his genius deserts him; no muse befriends; no invention, no hope. Which of the following does the author appear to highlight in this essay?