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
Diarrhoeal cases among children of an urban slum are on a rise. Almost all the mothers are illiterate and belong to lower socioeconomic class. It seems difficult to make them understand the use of ORS. What method can provide the best solution in this scenario? 
Select and explain. 
A. Radio Programme, B. Poster competition, C. Role playing, D. Lectures
C: Role playing
Answer: C: Role playing 
Explanation: None