This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Haematology, Subject name: Pathology
Which of the following is affected by platelet count- 
Select and explain. 
A. Bleeding time, B. Prothrombin time, C. Patial thromboplastin time, D. Thrombin time
A: Bleeding time
Answer: A: Bleeding time 
Explanation: Bleeding time is affected by platelet count.Platelets form critical role in haemostasis by forming the primary plug that initially seals vascular defects and by providing a surface that binds and concentrates activated coagulation factors. Prothrombin time assesses extrinsic and common coagulation pathway. PTT assesses the intrinsic and common clotting pathways. Thrombin time is a screening test for fibrinogen deficiency Reference ;1 Robbins and Cotran Pathologic basis of disease.South Asia Edition-9; volume 1.page no.117,656 2.Harsh Mohan textbook of pathology 7th edition.Pg no.307 308