Concept:Use the least possible Venn diagram to check which given conclusions definitely follow from the statements.
Explanation:Some bacteria are virus means the sets of bacteria and virus overlap partially.
No virus is malaria means the sets of virus and malaria have no common element.
Only a few mosquito are bacteria means some mosquito are bacteria and the remaining mosquito are definitely not bacteria.
Conclusion I: No malaria is bacteria → False, because only part of bacteria is related to virus, so it is possible but not definite.
Conclusion II: Some virus is malaria → False, because it directly contradicts the statement "No virus is malaria".
Conclusion III: Some mosquito are not bacteria → True, because "only a few mosquito are bacteria" definitely leaves some mosquito outside bacteria.
Answer:Only conclusion III follows, so option B is correct.
