Final answer:
The correct answer to the student's question is A. Mycology; Immunology, where mycology is the study of fungi and immunology is the study of the immune system's defenses. The correct option is (A).
Step-by-step explanation:
Microbiology has many branches of study; mycology is the detailed study of fungi, whereas immunology is the study of the body's defenses to infection. Therefore, the correct answer is A. Mycology; Immunology.
Mycology is a subfield of microbiology that focuses on different types of fungi, and individuals in this field may study various aspects of fungi such as taxonomy, fungal genomics, or the role of fungi in diseases.
On the other hand, immunology concerns itself with the immune system and its function in protecting the body against infectious diseases.