The cut off number of transfused blood units to start an iron chelating agent in chronic hemolytic anemia patients is:

Correct Answer: B

Rationale: Chronic hemolytic anemia patients typically require iron chelation after 8-10 transfusions to prevent iron overload and organ damage.

Correct Answer: D

Rationale: Alcohol use significantly increases suicide risk due to its disinhibiting effects and association with impulsive behavior.

Correct Answer: A

Rationale: Obstructive shock results from physical blockage of blood flow, such as cardiac tamponade or pulmonary embolism, impairing ventricular output.

Correct Answer: D

Rationale: Vitamin A deficiency is not associated with a large anterior fontanel. The other conditions listed can cause delayed fontanel closure or enlargement.

Correct Answer: C

Rationale: Hemophilia A is due to Factor VIII deficiency, leading to prolonged activated partial thromboplastin time (APPT), while PT and bleeding time remain normal.