This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Health education & planning, Subject name: Social & Preventive Medicine
Audio video visual guides include 
Select and explain. 
A. Radio, B. Television, C. Slides, D. Films
B: Television
Answer: B: Television 
Explanation: Audio-visual aidsNo health education can be effective without audiovisual aidsAuditory aids:Radio, tape-recorder, microphones, amplifiers, earphonesVisual aids:Not requiring projection: Chalkboard, leaflets, posters, chas, flannelgraph, exhibits, models, specimens etcRequiring projection: Slides, film stripsCombined A-V aids:Television; sound films, Slide tape combinationRef: Park; 23rd ed; Pg 863