This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Larynx, Subject name: ENT
[{'content': 'Which of the following muscle is supplied by external laryngeal nerve which is a branch of superior laryngeal nerve \nSelect and explain. \nA. Posterior cricoarytenoid, B. Cricothyroid, C. Lateral cricoarytenoid, D. Thyroarytenoid', 'role': 'user'}, {'content': "Answer: B \nExplanation: (Cricothyroid) (337, 358-D)Acting on vocal cords* Abductors: Posterior cricoarytenoid* Adductors: lateral cricoarytenoid; Interarytenoid (Transverse arytenoid); Thyroarytenoid (external part)* Tensors: Cricothyroid; Vocalis (internal part of thyroarytenoid)* All the muscles which move the vocal cord (abductors, adductors or tensors) are supplied by the recurrent laryngeal nerve except the cricothyroid.* Cricothyroid receives its innervations from the external laryngeal nerve - a branch of superior laymgeal nerve* Trottler's (or sinus of Morgagni) syndrome or Triad - seen in nasopharyngeal carcinoma* (i) Conductive hearing loss (ii) Ipsilateral immobility of soft palate (iii) Neuralgic pain in the distribution of V3", 'role': 'assistant'}]