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a
Pivot - Head rotation while saying ‘no’
b
Ball and socket - Flexion of forearm
c
Hinge joint - Nodding of head while saying ‘yes’
d
Fibrous joint - Bending of back bone
answer is A.
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Detailed Solution
Pivot joint between atlas and axis allows the rotation of the head while saying ‘no’.Hinge joint - Flexion of forearmCondyloid joint - Nodding of head while saying ‘yes’Cartilaginous & gliding joints - Bending of back bone