**Core Concept**
Tendon transfer operations in children with polio paralysis aim to restore muscle function and prevent contracture formation by rebalancing the muscle forces around a joint. This involves transferring a healthy tendon from one muscle to another to improve joint mobility and reduce deformity.

**Why the Correct Answer is Right**
In a child with polio paralysis, tendon transfer operations are typically performed between 3 to 5 years of age. This timing is crucial as it allows for enough time for muscle growth and development, while also preventing contractures that can occur due to muscle imbalance. The goal of the operation is to improve joint mobility, correct deformities, and enable the child to walk independently. The procedure involves transferring tendons from stronger muscles to weaker ones to restore balance and function.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because tendon transfer operations are typically not performed in infancy or early childhood, as the child's muscles are still developing and may not be strong enough to support the transferred tendon.
**Option B:** This option is incorrect because while tendon transfer operations can be performed in older children, the optimal age range is between 3 to 5 years, as it allows for better muscle balance and joint mobility.
**Option C:** This option is incorrect because tendon transfer operations are not typically performed in adulthood, as the joints and muscles are already fully developed and may be more prone to complications.

**Clinical Pearl / High-Yield Fact**
It's essential for surgeons to carefully assess the child's muscle strength, joint mobility, and overall muscle balance before performing a tendon transfer operation to ensure optimal outcomes.

**Correct Answer: C.**