A 25-Year-Old Man Experiences Severe Intolerance to Certain Medications

A 25-year-old man experiences severe intolerance to certain medications.  On 2 occasions, his reactions to various drugs have necessitated hospital admission.  His family pedigree with respect to this condition is shown below, with the red arrow indicating his position within the family. Assuming that the genetic condition demonstrates complete penetrance and is rare in the general population, which of the following inheritance patterns is most likely?

A) Autosomal dominant
B) Autosomal recessive
C) X-linked dominant
D) X-linked recessive
E) Mitochondrial

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