Within the last quarter of the twentieth century, medical experts have been laying emphasis on...

Within the last quarter of the twentieth century, medical experts have been laying emphasis on ___71___ rather than ___72___ measures. Through primary health care programmes, people have been taught about these. When an individual ___73___ a disease, he has to see a doctor for ___74___. At times, the doctor finds it difficult to ___75___ the disease during the initial examination of the patient because many diseases have similar ___76___. When this happens, the patient is either asked to go to the ___77___ for one test or the other or he would have ___78___ taken to help the doctor find out what is happening internally. it is after all these, and sometimes more, that the doctor can ___79___ some drugs for the individual and perhaps give him some ___80___. To save yourself and everyone else from this headache, it is advisable to pay heed to public health programmes.

In the following passage, the numbered gap 79 indicates a missing word.Four options are given in columns lettered A, to D. Choose the word that is themost suitableto fill the gap in the passage.