Who raised the question "who do you say I am"

A．she has a sweet face, a natural way and behaves gracefully
B．the author himself is kind of shy and doesn't make friends easily
C．She offers to talk with the author and smiles at him pleasantly
D．the author is deeply attracted by her graceful manners and sweet appearance

A．chimpanzees are likely to suffer AIDS just like humans if they are infected.
B．it does not matter if human beings are infected with SIV rather than HIV - 1.
C．we can use human vaccines to prevent chimpanzees from getting AIDS virus.
D．AIDS vaccines based on chimp' s immune mechanism are possible to be made.