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: Social & Preventive Medicine
A district has a total population of 10 lacs, with under 16 population being 30%. The prevalence of blindness is 0.8/1000 among under 16 population. Calculate the total number of blind among under 16 population in the district - 
Select and explain. 
A. 240, B. 2400, C. 24000, D. 240000
A: 240
Answer: A: 240 
Explanation: In this question, population of under-16 is 3 lacs (30% of 10 lacs).
Prevalence of blindness is 0.8 every 1000 under-16 population.
So total number of blind among under-16 population = 0.8 x 300000/1000 = 240