What is also called "swimmer's ear"
a. otitis media
b. otitis exterma
c. otitis interna
d. none of these options are correct

B. otitis exterma  

Explanation:

Every ear infection is called otitis. It will be called otitis externa (also known as a "swimmer's ear") if it affects the skin-lined outer ear region consisting of the ear pinna and the outer ear canal that ends in a membrane called the eardrum.

The most common cause of this type of earache is bacterial and fungal infection. Most of the time, these microorganisms penetrate through damage to the outer ear's skin caused by objects (swabs, staples, for example), scratching or drying of the ear, and contact with contaminated water (sea, pool, baths). Frequent contact with water can make it easier to remove the wax that protects the ear canal.

some fungi obtain their nutrients from a living host (plant or animal) and are called most biotrophic fungi have fairly narrow host ranges—they are specialized on a limited called rhizomorphs that allow the fungus to grow from one tree to another. ascospores are formed inside a sac-like structure called an ascus. so your answer is a