Correct Answer -B Ans: B. 4th arch Left RLN winds around the arch of aorta Arch of aorta is derived from the 4th arch Langmans Medical Embryology 13th edition (Page no 88,239)

Correct Answer - B Ans: B. Pretracheal fascia The thyroid gland is covered by a thin fibrous capsule, which has an inner and an outer layer. The inner layer extrudes into the gland and forms the septum that divides the thyroid tissue into microscopic lobules. The outer layer is continuous with the pretracheal fascia, attaching the gland to the cricoid and thyroid cartilages via a thickening of the fascia to form the posterior suspensory ligament of the thyroid gland also known as Berry's ligament. This causes the thyroid to move up and down with the movement of these cartilages when swallowing occurs. Gray's Anatomy: The Anatomical Basis of Clinical Practice, 41e ,Page no 470