Rock the Red Seal Cosmetology Exam 2026 – Style Your Future with Confidence!

A pathogenic disease is one that is caused by a microorganism, such as bacteria, viruses, fungi, or parasites. These microorganisms are able to enter the body and cause illness and infection. Pollution and genetic mutations can also lead to health problems, but they do not directly cause pathogenic diseases like the options in the answer choice A do. Therefore, the correct answer is A. Options B and C may contribute to certain diseases, but they are not the main cause and are not included in the answer choice. Option D is incorrect because it includes options B and C, which are not directly responsible for causing pathogenic diseases.