In FAB classification of acute lymphoblastic leukemia, which of the following is true:

Correct Answer: B

Rationale: L2 ALL is characterized by large, irregular blasts and is more common in adults.

Correct Answer: C

Rationale: Hymenoptera (bees, wasps, hornets, and ants) are the most common cause of systemic allergic reactions due to venom-induced IgE-mediated hypersensitivity, which can lead to severe anaphylaxis.

Correct Answer: A

Rationale: Foods are not a common cause of contact dermatitis, which is typically caused by direct skin contact with allergens like nickel, poison ivy, fragrances, and latex.

Correct Answer: D

Rationale: Gestational age and birth weight are the most critical risk factors for NEC, with lower gestational age and lower birth weight significantly increasing the risk.

Correct Answer: D

Rationale: In Munchausen by proxy, symptoms tend to worsen when the caregiver is present rather than disappearing. The parent may appear overly attentive but actually induces or fabricates illness in the child.