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
Megaloblastic anaemia occurs due to 
Select and explain. 
A. Iron deficiency, B. Folate deficiency, C. Vitamin C deficiency, D. Protein deficiency
B: Folate deficiency
Answer: B: Folate deficiency 
Explanation: None