This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2018, Subject name: Anatomy
[{'content': 'Trismus is due to spasm of which of the following muscle (FMGE Dec 2018) \nSelect and explain. \nA. Buccinator, B. Lateral pterygoid, C. Medial pterygoid, D. Mentalis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: M - Medial pterygoid - inseed to ramus of mandible from inner side T - Temporalis - inseed into coronoid process of mandible M -Masseter-- inseed to ramus of mandible from outside Lateral pterygoid - depressor of mandible - pull mandible antero-inferiorly and open the mouth Antagonize (MTM muscles) *Tetanus neonatorum - spasm of masseter *Trismus - spasm of muscles of mastication especially medial pterygoid muscle. Mentalis: Deepest muscle of lower group arising from mandible just inferior to incisor teeth, with fibers passing downward & medially to inse into skin of chin. It raises & protrudes lower lip as it wrinkles skin of chin Help position lip when drinking from cup / when pouting Buccinator: Compresses cheek against teeth & is used in acts like blowing', 'role': 'assistant'}]