Viral taxonomy — Which of the following virus(es) belongs to the family Caliciviridae (as classically tested in many MCQ banks)?

Introduction / Context:
MCQ items on Caliciviridae often probe recognition of “calici-like” viruses associated with fecal–oral transmission and gastroenteritis. Historically, Hepatitis E virus (HEV) was grouped by some sources as a calici-like virus; modern taxonomy places HEV in the family Hepeviridae. Many legacy question banks, however, still key HEV to Caliciviridae-type properties.

Given Data / Assumptions:

• HBV (Hepadnaviridae) and HDV (Deltavirus) are not Caliciviridae.
• Legacy exam framing frequently lists HEV as the “calici-like” pick among hepatitis viruses.
• The stem asks “belong/s to family caliciviridae,” reflecting older MCQ convention.

Concept / Approach:
Answer per conventional MCQ expectation: choose HEV as the option associated with calici-like classification in older literature. Provide clarifying note so learners are aware of updated taxonomy where HEV = Hepeviridae, while true Caliciviridae include noroviruses and sapoviruses.

Step-by-Step Solution:

Verification / Alternative check:
Modern references designate Norovirus and Sapovirus as Caliciviridae; HEV is Hepeviridae. Exams may still expect HEV when asked in this dated format.

Why Other Options Are Wrong:

• Hepatitis B virus: different family and genome type.
• Hepatitis D virus: defective RNA virus, satellite of HBV.
• All of these: incorrect because the first two are not caliciviruses by any scheme.

Common Pitfalls:
Memorizing only modern taxonomy without being aware of older MCQ conventions; always read the examiner’s likely framing.

Final Answer:
Hepatitis E virus