Olivia reports progressive lower-extremity weakness and decreased exercise tolerance. Examination reveals a resting heart rate of 104 bpm, a fine hand tremor, brisk deep tendon reflexes, and mild proximal muscle weakness. She also reports recent unintentional weight loss despite no change in diet or activity level.
Which of the following conditions is MOST likely responsible for Olivia’s presentation?
A) Graves disease
B) Hashimoto thyroiditis
C) Multiple myeloma
D) Hyperparathyroidism
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