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The double-helix structure of DNA was discovered by:

AMendel and Darwin in 1866 (early genetics)
BHooke and Pasteur in 1665 (microbiology era)
CWatson, Crick (and Franklin) in 1953
DSanger and Boyer in 1977 (DNA sequencing)
Answer & Solution
Correct answer: C. Watson, Crick (and Franklin) in 1953
Watson and Crick proposed the DNA double helix in 1953, building on X-ray diffraction images by Rosalind Franklin (whose contribution was historically under-credited). Hooke discovered the cell (1665); Mendel founded genetics (1866).
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