Forensic entomology does not include

a) mediocolegal cases involving elderly people dying of natural causes
b) roach droppings in oatmeal sold at the grocery store
c) flea infestations found at a dog pound
d) a home owner who died of a wasp sting while painting his house

Forensic entomology is defined as the application of entomology as a field, in the investigation of a crime. Forensic entomologists work a lot with insects, bugs, and arachnids (spiders and such). People working in this field would often provide assistance for law enforcement and medical examiners on a case-by-case basis.

Thus, the best answer for the question is (A) mediocolegal cases involving elderly people dying of natural causes.