Before revision:  It is demonstrated that the pitch angle of DNA is well below 45 deg. For A-DNA it is approximately 28 deg., and for B-DNA  approximately 38 deg., in accord with the principle of optimal packing of tubular double helices .
After revision:  It is demonstrated that the pitch angle of B-DNA must be smaller than the angle of zero-twist. At the zero-twist angle the double helix is maximally rotated and its strain-twist coupling vanishes. A numerical estimate of the pitch angle for B-DNA approximately 38 deg., in accord with the principle of optimal packing of tubular double helices .