This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nutrition and health, Subject name: Social & Preventive Medicine
Extra energy requirement during first three months of lactation (in Kcal/d) - 
Select and explain. 
A. 350, B. 600, C. 520, D. 450
B: 600
Answer: B: 600 
Explanation: During the first three months of lactation, extra energy requirement is 600Kcal/day.(REF. PARK'S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICAL 21ST EDITION. PAGE NO - 585)