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
On exposure to sunlight which vitamin is lost - 
Select and explain. 
A. Vitamin A, B. Vitamin B1, C. Vitamin B6, D. Vitamin C
D: Vitamin C
Answer: D: Vitamin C 
Explanation: Vitamin C is the most sensitive of all vitamins to heat. (REF. PARK'S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICAL 21ST EDITION. PAGE NO - 621)