Read the following context and choose the best option to answer the question.
Context: He also said he had n't seen such high levels of the virus before , and implied that 's he rather surprised I can make it through a day without a nap or four . The other thing is that he suspects I have a sleep disorder and he 's ordered a sleep study for that . The result of these two seemingly trivial items is that the virus makes me sleepy as hell but with the sleep disorder , I ' m just not getting restful sleep . My body is literally rebelling due to not enough rest .
Question: Who is the person that the speaker is consulting with about their disease progression ?
Options: 
A. He is a science fiction writer who is studying her symptoms to write a book about them
B. He is a priest who is trying to provide spiritual counsel through this difficult time
C. He is a scam artist , and is pretending to know what he is talking about to bill her unnecessarily
D. He is an infectious disease specialist who is trying to help treat her symptoms


D