53. Consider the following statements:
Life-threatening pneumococcal infection is a complication seen in
1. Idiopathic thrombocytpaenic purpura
2. Sickle cell disease
3. Thalassemia minor
4. Nephrotic syndrome
Which of the statements given above is/are correct?
(a) 1 only
(b) 1 and 3
(c) 2 and 4 only
(d) 2, 3 and 4