Final answer:
The client at the greatest risk of acquiring a serious fungal infection is a client who is taking an immunosuppressant.
Step-by-step explanation:
The client at the greatest risk of acquiring a serious fungal infection is a client who is taking an immunosuppressant (option C).
Fungal infections are generally challenging to treat and can be deadly for individuals with compromised immune systems. Taking an immunosuppressant medication weakens the immune system, making the person more susceptible to fungal infections.
For example, patients with organ transplants who are on immunosuppressant drugs are at a higher risk of acquiring fungal infections like cryptococcal meningitis. This infection is caused by a fungus called Cryptococcus neoformans, which is commonly found in bird droppings but rarely affects immunocompetent individuals. However, people taking immunosuppressant medications have a higher likelihood of being affected.