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The CAUSE of the flu epidemic of 1918 remains unknown to this day.

  • A. Pathology
  • B. Transmission
  • C. Cause
  • D. Mortality rate
Correct Answer: C

Rationale: The term 'cause' refers to the reason or origin of a disease outbreak. In the context of the flu epidemic of 1918, identifying the specific cause is essential for prevention and control strategies. 'Pathology' involves the study of diseases, 'transmission' relates to how a disease spreads, and 'mortality rate' indicates the number of deaths caused by a disease. While these aspects are relevant to understanding the impact of an epidemic, they do not directly address the root or origin of the outbreak, which is signified by the term 'cause'. Therefore, the correct answer is 'C: Cause'.