Sudden jerking causing sudden extension and abduction of extremities in newborns is known as -

Correct option is A

Sol. The Moro reflex is a primitive reflex seen in newborns, where a sudden stimulus (like a loud sound or a sudden movement) causes the baby to extend the arms, spread the fingers, and then bring the arms back towards the body. It is an important sign of normal neurological development and usually disappears by 4-6 months of age.
Explanation of Each Option:
· Moro reflex: Correct answer; a startle reflex causing sudden limb extension in newborns.
· Babinski reflex: Incorrect; involves upward toe movement when the sole is stroked, a normal reflex in infants.
· Gag reflex: Incorrect; a protective reflex that prevents choking.
· Grasp reflex: Incorrect; newborns close their hand around an object when the palm is touched.