Before revision:  We validate our claim by extensive Brownian dynamics (BD) simulation which also reveals that the prefactor A used to describe the chain extension in the Odjik limit is independent of physical dimension d and is the same as previously found by Burkhardt {\em et al.
After revision:  We validate our claim by extensive Brownian dynamics (BD) simulation which also reveals that the prefactor A used to describe the chain extension in the Odjik limit is independent of physical dimension d and is the same as previously found by Yang {\em et al.