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: ENT
[{'content': 'Trismus in parapharyngeal abscess is caused by spasm of which of the following muscle? \nSelect and explain. \nA. Medial pterygoid, B. Lateral pterygoid, C. Masseter, D. Temporalis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Parapharyngeal space - It is pyramidal in shape . base at base of skull and apex at hyoid bone Its divided into two components anterior & posterior. The trismus is seen in the anterior compament parapharyngeal abscess and it is due to spasm of the medial pterygoid muscle.', 'role': 'assistant'}]