Final answer:
The question seems to contain a typo where '1D50' likely refers to 'ID50', or median infectious dose. The incubation period is the time between infection and the appearance of symptoms, while the prodromal phase involves early symptoms after the incubation period. The correct answer should describe these terms, but none of the provided options entirely fit. Option B is the closest, but it contains incorrect information.
Step-by-step explanation:
The definitions of '1D50', 'incubation period', and 'prodromal phase' are important concepts in the study of infectious diseases in the field of Biology. The correct definitions are as follows:
- 1D50 - This is a typo, but in the context of biology, it likely refers to 'ID50', which is the median infectious dose. It's the concentration of a pathogen that will produce an active infection in 50% of test animals inoculated.
- Incubation period - This is the length of time between infection with a pathogen or other agent of disease and the first appearance of symptoms.
- Prodromal phase - This occurs after the incubation period, where the host begins to experience early, general signs and symptoms of illness.
The correct answer to match these definitions is option B: Median inhibitory dose, Time between exposure and symptoms, Late symptoms. However, there is a mistake in this option since 'median inhibitory dose' does not seem appropriate in this context, and 'late symptoms' does not accurately describe the prodromal phase which is characterized by early symptoms.