A nurse is caring for a client who has developed agranulocytosis as a result of taking propylthiouracil to treat hyperthyroidism. The nurse should understand that this client is at increased risk for which of the following conditions?

The correct answer is A: Infection. Agranulocytosis is a condition characterized by a severe decrease in the number of white blood cells (specifically granulocytes) which are essential for fighting infections. With a low white blood cell count, the client is at an increased risk for developing infections due to the compromised immune system. The other choices, B: Excessive bleeding, C: Hyperglycemia, and D: Ecchymosis are not directly related to agranulocytosis. Excessive bleeding is more commonly associated with conditions affecting platelets or clotting factors, hyperglycemia is related to blood sugar levels, and ecchymosis refers to bruising which is not specifically linked to agranulocytosis.