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
What is/are components of Nutrition surveillance? 
Select and explain. 
A. Policy maker, B. National survey, C. AFP surveillace, D. DOTS
A: Policy maker
Answer: A: Policy maker 
Explanation: Nutritional surveillance Keeping a watch over nutrition, in order to make decisions that will lead to improvement in nutrition of population Main strategy: Detection of malnutrition (Nutritional survey) Approach : Diagnostic-interventional Sample: Representative, 50-100 size group Objectives To aid health and development To provide input for program management and evaluation (to policy maker) To give timely warning and intervention (to prevent sho-term food crises) Ref: Park 25th edition Pgno : 688