In which condition is the patient most likely to hemorrhage?

A. Thrombocytopenia
B. Polycythemia
C. Thalassemia
D. Erythroblastosis fetalis

I think the answer is (A)

Since this is not my area of expertise, I searched Google under the key words "Thrombocytopenia" to get these possible sources:

http://en.wikipedia.org/wiki/Thrombocytopenia
http://www.mayoclinic.com/health/thrombocytopenia/DS00691
http://www.nlm.nih.gov/MEDLINEPLUS/ency/article/000586.htm

You can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.

I hope this helps. Thanks for asking.