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
Most common ocular movement affected in thyroid ophthalmopathy- 
Select and explain. 
A. Adduction, B. Abduction, C. Elevation, D. Depression
B: Abduction
Answer: B: Abduction 
Explanation: Unilateral elevator palsy caused by an involvement of the inferior rectus muscle followed by failure of abduction due to involvement of medial rectus muscle. Ref .ak khurana 6th edition pg no 414