Reactive arthritis is defined as joint inflammation caused by a sterile inflammatory reaction following a recent infection. Of the following, the LEAST likely micro-organism that may cause reactive arthritis is

Correct Answer: A

Rationale: Clostridium difficile is less commonly associated with reactive arthritis.

Correct Answer: D

Rationale: Foods are not a common cause of ocular allergies, which are typically triggered by airborne allergens.

Correct Answer: D

Rationale: Anaphylactic (immunological) shock is a severe allergic reaction leading to vasodilation and capillary leakage.

Correct Answer: D

Rationale: ALS involves vascular access, fluid resuscitation, and breathing support, but not every arrhythmia needs immediate intervention.

Correct Answer: C

Rationale: Elimination and challenge testing is the gold standard for diagnosing cell-mediated food reactions as IgE tests are not reliable.