Shortest incubation period is seen in-: (A) Influenza, (B) Hepatitis B, (C) Hepatitis A, (D) Rubella
Answer is A. Mumps → 16 - 18 days
Influenza → 2 - 3 days
Hepatitis A → 15 - 90 days
Hepatitis B →  6 wk to 6 months