Raised intracranial tension (ICP) in children is defined as:

Correct Answer: D

Rationale: ICP above 20 mmHg for more than 5 minutes is considered raised and can cause brain herniation and ischemia.

Correct Answer: C

Rationale: Bone marrow infiltration is rare in Hodgkin's lymphoma but common in Non-Hodgkin's lymphoma.

Correct Answer: D

Rationale: RAST measures antigen-specific serum IgE concentrations to identify allergens.

Correct Answer: D

Rationale: Vitamin B12 deficiency leads to macrocytic anemia due to impaired DNA synthesis.

Correct Answer: B

Rationale: Normal anion gap metabolic acidosis is caused by bicarbonate loss, such as in diarrhea, where excessive bicarbonate is lost through stool, leading to acidosis.