This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ocular Motility, Subject name: Ophthalmology
Muscle first affected in thyroid ophthalmopathy is: 
Select and explain. 
A. Medial rectus, B. Lateral rectus, C. Inferior rectus, D. Superior rectus
C: Inferior rectus
Answer: C: Inferior rectus 
Explanation: Ans. (c) Inferior rectusRef.: A.K. Khurana 6th ed. /414* In thyroid eye ophthalmopathy, the ocular motility defects due to restrictive myopathy (in order of frequency) are:# Elevation (due to fibrosis of inferior rectus)# Abduction (due to fibrosis of medial rectus)# Depression (due to fibrosis of superior rectus)# Adduction (due to fibrosis of lateral rectus).Mnemonic - "I M Shy Ladka"