Health communication is a behavior that translates the results of medical research into the public's health knowledge, and reduces the morbidity and mortality through changes in people's attitudes and behaviors, and effectively improves the quality of life and health of a community or country. According to the above definitions, Which of the following are not health transmission:. ['A high school lecture on preventing spring infectious diseases.', "Children's hand, foot, and mouth disease prevention and promotion in a community.", 'A provincial television broadcasts advertisements for cataract prevention drugs.', 'A hospital holds a conference on the treatment of cardiovascular and cerebrovascular diseases.']