**Question:** Grasp reflex develops by -

A. Babinski reflex
B. Deep tendon reflex
C. Plantar reflex
D. Pinch reflex

**Core Concept:** The grasp reflex is a primitive reflex that helps infants to grasp objects, facilitating their exploration and development. It is a reflexive response that occurs involuntarily and is essential for motor skill development.

**Why the Correct Answer is Right:**

The correct answer, **D. Pinch reflex**, is involved in the development of grasp reflex in infants. The pinch reflex is a primitive reflex that is essential for the maturation of the central nervous system. When a small object is placed near the baby's fingertips, the infant will reflexively close their fingers around the object, demonstrating the grasp reflex. This reflex is a crucial developmental milestone, enabling infants to explore their environment and improve their motor skills.

**Why Each Wrong Option is Incorrect:**

A. **Babinski reflex**: The Babinski reflex is an abnormal reflex response seen in adults, characterized by the eversion of the great toe in response to stimulation of the sole of the foot. It is not related to the development of grasp reflex in infants.

B. **Deep tendon reflex**: Deep tendon reflexes, such as the knee and Achilles reflexes, involve the stimulation of tendons and are not related to the development of grasp reflex in infants.

C. **Plantar reflex**: The plantar reflex, also known as the Babinski reflex, is another abnormal response seen in adults, characterized by eversion of the great toe in response to stimulation of the sole of the foot. It is not relevant to the development of grasp reflex in infants.

**Clinical Pearl:** The grasp reflex is a significant developmental milestone in infants, as it aids in their exploration of their environment and helps them develop their fine motor skills. This reflex typically disappears by the age of 1-2 years as infants progress to more complex motor skills. Understanding the maturation of primitive reflexes is essential for pediatricians and developmental paediatricians in evaluating infants for developmental milestones and identifying any potential delays or abnormalities.