To determine which vaccine should be administered annually, we need to consider the nature and behavior of the diseases and their corresponding vaccines.
1. Hepatitis A: The Hepatitis A vaccine is typically given in a series of two shots to provide long-term protection. It is not administered every year.
2. Hepatitis B: The Hepatitis B vaccine is generally given as a series of three or four shots over six months for long-lasting protection. It also is not needed annually.
3. Influenza: The influenza virus changes frequently, necessitating an updated vaccine each year to provide effective protection against the most current strains.
4. Chicken pox: This vaccine is given in a two-dose series, offering long-term immunity and is not required annually.
The correct choice is the Influenza vaccine, administered every year due to the virus's rapid mutation.
A fruit farmer presents with fever, respiratory difficulties, and neurological complications. What is the most likely diagnosis? 
Which of the following vaccines is kept at the lowest level? 
The normal pH of arterial blood is:
Which enzyme is deficient in Gaucher’s disease?
Which of the following cranial nerves is responsible for the motor innervation of the muscles of mastication?
The anticoagulant effect of heparin is monitored using:
The causative agent of malaria is: