Who discovered DNA in 1953 using Rosalind Franklin's work?

• A. Watson and Crick
• B. Franklin and Wilkins
• C. Crick and Watson
• D. Pasteur and Koch

Answer: (C)

In 1953, Crick and Watson proposed the double‑helix model of DNA, and they did so by using Rosalind Franklin's X‑ray diffraction data as crucial evidence. Her images helped them see that DNA is a helix and provided details about the geometry of the molecule. They also drew on Maurice Wilkins’ data and Chargaff’s rules about base pairing, which showed that A pairs with T and G pairs with C. Put together, these insights let them construct a model with two antiparallel sugar‑phosphate strands and bases paired inside, which they published in Nature that year. The question’s phrasing highlights Franklin’s contribution, but the individuals who completed the final structure are Crick and Watson. The other options point to scientists outside this discovery or mix the collaborators differently.