Last ocular muscle to be involved in Graves' disease-: (A) Inferior rectus, (B) Lateral rectus, (C) Superior rectus, (D) Inferior oblique
Answer is D. *Order of involvement (Mnemonic : IM SLO) :- Inferior rectus > medial rectus > superior rectus > Lateral rectus > obliques. Ref: Head & Neck Surgery 2nd/e p.1513