The question below consists of a set of labelled sentences. These sentences, when properly sequenced form a coherent paragraph. Select the most logical order of sentences from among the options. P: Modern medicine has scored significant victories against both, and the major causes of ill health and death are now the chronic degenerative diseases, such as coronary artery disease, arthritis, osteoporosis, Alzheimer's, macular degeneration, cataract and cancer. Q: It follows that the majority of apparently healthy people are pre-ill. R: Throughout human history the leading causes of death have been infection and trauma. S: These have a long latency period before symptoms appear and a diagnosis is made.