The new cardiologist is a poor choice because, The cardiologist is not recommended by her current cardiologist.
Cardiology is a medical field or a branch that deals with internal medicine concerned with disorders of the heart.
It deals with the diagnosis and therapy of such disorders as congenital heart defects, coronary artery disease, heart failure, etc.
Thus, option 'D" is correct, because other option favour the cardiologist.
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