Muscles forming boundaries of carotid triangle are all except: (A) Posterior belly of digastric, (B) Superior belly of omohyoid, (C) Inferior belly of omohyoid, (D) Sternocleidomastoid
Answer is C. Boundaries of carotid triangle are :

Anterosuperiorly – posterior belly of digastric.
Anteroinferiorly – superior belly of omohyoid.
Posteriorly – sternocleidomastoid muscle.