Step 1: Understanding lichen structure.
Lichens are a mutualistic symbiotic relationship between fungi and photosynthetic organisms (usually algae or cyanobacteria).
The fungal part is called the "mycobiont," and the photosynthetic partner is called the "phycobiont."
Step 2: Identifying other terms.
Phycobiont: This refers to the photosynthetic partner in a lichen, not the fungal part.
Mycoparasite: A mycoparasite is a fungus that parasitizes another fungus, not part of lichen.
None of these: This is incorrect, as "mycobiont" is the correct term.
Thus, the correct answer is (B) Mycobiont.