听一段材料，回答下面几个小题。
Why does the man want to talk to Dr. Perkins on the phone?
A. To discuss something with the doctor.
B. To ask Dr. Perkins to give a lecture.
C. To see him about his illness.
What is the doctor doing at the moment?
A. Giving an operation.
B. Giving a lecture.
C. Having a meeting.