As you're waiting at the doctor's office, you overhear another patient discussing with the doctor how unlucky he is to be going bald at such a young age. The doctor counters this assertion and explains that:

A) it is not unlucky but rather unfortunate that we do not yet understand the cause of baldness.

B) luck has nothing to do with it; rather an SNP (single nucleotide polymorphism) can code for susceptibility to baldness, so his problem is genetic.

C) only men over the age of 50 go bald, so the patient is exaggerating.

D) baldness is common in Asian populations, so the patient must have Asian ancestry.