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: Pharmacology
Macrocytic anaemia is caused by all EXCEPT : 
Select and explain. 
A. Pyrimethamine, B. Methotrexate, C. Pentamidine, D. Trimethoprim
C: Pentamidine
Answer: C: Pentamidine 
Explanation: None