In this task, you are given a question and answer options for that question. Using this information, you have to classify each text into different topics: medicine, nursery, psychology, chemistry, pharmacology, biology.

Question: Fibrinogen is activated by: 
 Options:  <0> Platelet stopper <1> Plasmina. <2> Thrombin <3> Thromboplastin. <4> Factor von Willebrand.
biology

Question: Question linked to image nº1 40-year-old man with no relevant background. For 4 weeks, refers to diarrheic stools, associated with jaundice of skin and mucous membranes, coluria, hypocholia and pain in right hypochondrium, accompanied by weight loss (10 kg approx) and intense itching. In the analytical highlights: Total bilirubin: 15.3 mg / dl. Alanine aminotransferase: 70 U / l Aspartate aminotransferase: 85 U / l. Serology for negative hepatitis and elevation of CA 19-9. Abdominal CT is performed. 3 axial sections are shown. In relation to the findings of the radiological test, which of the following statements is true? 
 Options:  <0> A tumoral mass is observed in the head of the pancreas that causes biliary and ductal dilatation compatible with adenocarcinoma. <1> Presence of diffuse thickening of the pancreas with arcuate Wirsung compatible with lymphoplasmacytic pancreatitis. <2> A tumoral mass is identified in a vesicular infundibulum compatible with vesicular adenocarcinoma. <3> Voluminous tumor lymphadenopathies are observed in the hepatic hilum that produce dilation of the bile duct. <4> Presence of multiple solid focal liver lesions compatible with diffuse liver metastases.
medicine

Question: The first morphological sign of human gastrulation is: 
 Options:  <0> Formation of the neural tube. <1> Formation of the primitive line. <2> Implantation. <3> Compaction <4> Ovulation.

biology