This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diseases of orbit, Lids and lacrimal apparatus, Subject name: Ophthalmology
All of the following associated with extraocular muscles weakness except 
Select and explain. 
A. Fisher syndrome, B. Myasthenia gravis, C. Eaton Lambe syndrome, D. Thyrotoxicosis
D: Thyrotoxicosis
Answer: D: Thyrotoxicosis 
Explanation: In thyrotoxicosis, there is fibrosis of muscle. I. E restrictive myopathy Refer khurana 6/e p 420