This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: NEET 2019, Subject name: Surgery
[{'content': 'Most commonly used approach for retrosternal goitre:- \nSelect and explain. \nA. Transthoracic second intercostal space, B. Trans-sternal through anterior mediastinum, C. Transcervical, D. Axillary approach', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Retrosternal goitre: - >50% thyroid tissue located below neck - A.K.A i. Sub-sternal Goitre ii. Mediastinal Goitre Retrosternal Goitre Primary Mediastinal Goitre - BLOOD SUPPLY From Neck region From mediastinum region - APPROACH Transcervical Thoracic Primary Mediastinal Goitre: Diameter of Goitre > Thoracic inlet', 'role': 'assistant'}]