The client newly diagnosed with multiple sclerosis (MS) states, 'I don't understand how I got multiple sclerosis. Is it genetic?' On which statement should the nurse base the response?

D Multiple sclerosis is caused by an autosomal dominant gene on the Y chromosome, so only fathers can pass it on. A Genetics may play a role in susceptibility to MS, but the disease may be caused by a virus. C Multiple sclerosis is caused by a recessive gene, so both parents had to have the gene for the client to get MS. B There is no evidence suggesting there is any chromosomal involvement in developing MS.