Carrie Is 65 Years Old

Carrie is 65 years old.She is experiencing muscular rigidity on one side of her body.At times,Carrie loses her balance and finds it hard to coordinate her body movements.When she visits Dr.Calvin for an examination,he asks her if she has been experiencing tremors.Carrie tells Dr.Calvin that she trembles only when she is not moving.Dr.Calvin examines Carrie's heart rate and notices that it is abnormally low.With what condition will Dr.Calvin most likely diagnose Carrie?

A) Alzheimer's disease
B) Parkinson's disease
C) Huntington's chorea
D) Tourette's syndrome