Answer:
I think the answer should go to D breathlessness
A quality or idea that is considered to be important.
Lachrymose means very sad and tearful.
Sentence: She was lachrymose after she heard that her parents died for her sake.
I believe that it is B, because the term vivisection isn't commonly used amongst society, or what we consider is the "normal" type of topic to talk about. The answer be clarifies what exactly the type of testing is, which is medical.