This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
Carbamazepine has been utilized to successfully diminish attacks in trigeminal neuralgia. During this therapy, which of the following is indicated? 
Select and explain. 
A. Clinical observation only, B. Clinical observation and complete blood and platelet counts prior to and at frequent intervals during therapy, C. No monitoring, D. Complete blood investigation, only if adverse symptoms arise
B: Clinical observation and complete blood and platelet counts prior to and at frequent intervals during therapy
Answer: B: Clinical observation and complete blood and platelet counts prior to and at frequent intervals during therapy 
Explanation: Aplastic anemia and leucopenia are rare complications of carbamazepine therapy. So, the patients receiving carbamazepine must have periodic hematological laboratory investigations.