In the context of alternative DNA forms, which conformation is considered the relaxed (low-energy, physiological) form of DNA under typical cellular conditions?

• A. Z-DNA (left-handed helix favored by alternating purine-pyrimidine sequences)
• B. B-DNA (right-handed helix with ~10.5 bp per turn)
• C. G-quadruplex DNA (four-stranded structure stabilized by guanine tetrads)
• D. A-DNA (right-handed, dehydrated form commonly found in DNA-RNA hybrids)

Answer: (B)