Incubation period vs infectious period: which statement is correct?

• A. The incubation period and infectious period are always equal.
• B. The incubation period is the time from exposure to onset of symptoms; the infectious period is when an infected person can transmit the pathogen.
• C. The incubation period is the time during which a person can transmit the pathogen; the infectious period is the time from exposure to symptoms.
• D. The incubation period occurs after the infectious period.

Answer: (B)