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Which is the most common mutation found in CF (Cystic Fibrosis)?
a) A nonsense mutation is the most devastating.
b) delta 508 A defective CFTR does not allow chloride to cross the membrane and so water does not cross either.
c) CF only affects one type of protein and is not controlled by more than one gene.
d) A mutation in exon 23 is a nonsense mutation.