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Genetic Question from IBO

builgate
in Biology

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I have taken the following question from Internation Biology Olympiad. I can't figure out the answer yet.

 

45 In the European population, about 1 in 2500 people suffers from Cystic Fibrosis, a genetically determined (descared), autosomal disease. Healthy parents have a child suffering from Cystic Fibrosis. The woman remarries a healthy man. What is the chance of a child from this second marriage suffering from Cystic Fibrosis:

 

A 1 : 25

B 1 : 50

C 1 : 100

D 1 : 625

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I am not sure what "descared " mean. It is taken from the original question paper. I am thinking how to calculate the possibility of getting a "healthy man" ( i think it includes the homozygous and carrier) in the second marriage?

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