Which of the following diseases is characterised by Charcot's triad?

Correct option is A

Charcot's triad refers to the classic symptoms of multiple sclerosis (MS), which include nystagmus, intention tremor, and scanning speech. This triad is commonly associated with MS, a chronic autoimmune disease that affects the central nervous system.
Explanation of options: (a) ✔ Correct. Charcot's triad is most commonly associated with multiple sclerosis. (b) ✘ Incorrect. Parkinson's disease is characterized by tremors, rigidity, bradykinesia, and postural instability, not Charcot's triad. (c) ✘ Incorrect. Guillain-Barré syndrome typically presents with ascending paralysis and is not associated with Charcot's triad. (d) ✘ Incorrect. Myasthenia gravis presents with muscle weakness and fatigue but is not characterized by Charcot's triad.