A 45-year-old woman presents with a six-month history of numbness, tingling and weakness in her right hand, especially affecting her thumb, index and middle fingers. She also reports relief of her symptoms when hanging her arm over the side of the bed. On examination, she has a positive Phalen's sign. What is the most likely diagnosis?

A. Carpal tunnel syndrome

B. Crohn's disease

C. Hyperthyroidism

D. Guillain-Barré syndrome (GBS)

E. Rheumatoid arthritis

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