Platelet Count and Function Studies Are Performed on a Patient

Platelet count and function studies are performed on a patient with a history of easy bruising,and the following results are obtained:
$\begin{array}{ll}\underline { \text { Test }}&\underline { \text { Result }}\\\text { Platelet count } & 295 \times 10^{9} / \mathrm{L} \\\text { Platelet function assay } & \text { Prolonged } \\\text { Platelet aggregation with epinephrine } & \text { Primary but no secondary wave } \\\text { Platelet aggregation with low-dose adenosine } & \text { Primary but no secondary wave }\\\text { diphosphate (ADP) }\\\text { Platelet agoregation with ristocetin }& \text { Normal }\\\end{array}$
What is the most likely diagnosis for this patient?

A) Bernard-Soulier disease
B) dense granule deficiency
C) Glanzmann thrombasthenia
D) gray platelet syndrome

Correct Answer:

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