###Rationale: Ans. is 'a' i.e., Thyrotoxicosis o Thyroid eye disease (TED) is also known as Grave's ophthalmopathyo Among patients of TED:# 90% - Thyrotoxicosis# 6% - Euthyroidism# 3% - Hashimoto's disease# 1% - Hypothyroidism

###Answer: OPTION A IS CORRECT.
###Question: Thyroid eye disease is due to -
###Options:
A. Thyrotoxicosis
B. Hypothyroidism
C. Euthyroidism
D. Hashimoto's disease
