which of the following is not an unconditioned reflex

1. corneal reflex
2. knee jerk
3. breast feeding
4. riding a bicycle

Hello student
Correct answer is 4. Riding a bicycle
Riding a bicycle is a conditioned reflex which is acquired after birth. Learning forms the basis of conditioned reflex. On the other hand, incondiotioned reflexes are inborn reflexes and transmitted through heredity.