Given a question and a context passage, generate the answer having the word or phrase from the context passage. Here, the answer should be a shortest continous span from the passage.

Context: Do you know what your blood type is? Maybe you have heard people say that they have type A or type O blood. Blood type is a way to describe the type of antigens, or proteins, on the surface of red blood cells (RBCs). There are four blood types; A, B, AB, and O. 1. Type A blood has type A antigens on the RBCs in the blood. 2. Type AB blood has A and B antigens on the RBCs. 3. Type B has B antigens on the RBCs. 4. Type O does not have either A or B antigens. The ABO blood group system is important if a person needs a blood transfusion. A blood transfusion is the process of putting blood or blood products from one person into the circulatory system of another person. The blood type of the recipient needs to be carefully matched to the blood type of the donor. Thats because different blood types have different types of antibodies, or proteins, released by the blood cells. Antibodies attack strange substances in the body. This is a normal part of your immune response, which is your defense against disease. For example, imagine a person with type O blood was given type A blood. First, what type of antibodies do people with type O blood produce? They produce anti-A and anti-B antibodies. This means, if a person with type O blood received type A blood, the anti-A antibodies in the persons blood would attack the A antigens on the RBCs in the donor blood ( Figure 1.1). The antibodies would cause the RBCs to clump together, and the clumps could block a blood vessel. This clumping of blood cells could cause death. A person with type O blood has A and B antibodies in his/her plasma; if the person was to get type A blood instead of type O, his/her A antibodies would attach to the antigens on the RBCs and cause them to clump together. People with type A blood produce anti-B antibodies, and people with type B blood produce anti-A antibodies. People with type AB blood do not produce either antibody. The second most important blood group system in human blood is the Rhesus (Rh) factor. A person either has, or does not have, the Rh antigen on the surface of their RBCs. If they do have it, then the person is positive. If the person does not have the antigen, they are considered negative. Recall that people with type O blood do not have any antigens on their RBCs. As a result, type O blood can be given to people with blood types A, B, or AB. If there are no antigens on the RBCs, there cannot be an antibody reaction in the blood. People with type O blood are often called universal donors. The blood plasma of AB blood does not contain any anti-A or anti-B antibodies. People with type AB blood can receive any ABO blood type. People with type AB blood are called universal recipients because they can receive any blood type. The antigens and antibodies that define blood type are listed as follows ( Table 1.1). Blood Type Antigen Type Plasma Antibodies A B AB O A B A and B none anti-B anti-A none anti-A, anti-B Can Receive Blood from Types A,O B,O AB, A, B, O O Can Donate Blood to Types A, AB B, AB AB AB, A, B, O 
 Question: a person with blood type a can receive blood from
a and o.

Context: Darma (Pierre Andre) is traumatised by the mysterious death of his fiancee, Rose (Intan Ladyana) who had killed herself. Unknown to him, Rose had been haunted by a malicious spirit which they had brought to her home after picking up a small jar found washed up at the beach. Apparently, the spirit had been imprisoned and was inadvertently released by the couple.At her home, after her death, before leaving Darma had taken the small jar with him, and with it, the malignant spirit.Not satisfied with why Rose had suddenly killed herself, Darma decides to investigate the case with the help of Rose's twin sister, Seri, (also played by Intan Ladyana). As they probe into the death, a series of strange occurrences start to unravel, leaving Darma in a disturbed state of mind that affects his life and career. When he is advised to take a week's break from work, he returns to his village to rest. Unknown to him, he is only getting closer to solving his fiancee's death and the truth behind the strange happenings.It was Darma's senile grandmother who could see the ghost and had unwittingly invited the spirit into the house. In Malay belief, certain spirits cannot enter the house unless invited in. This is similar to the vampire mythology in the West. The ghost in this movie is called Saka. Saka was a ghost that has been kept by the elder for some uncertified reason. Mostly, Saka starts to give problems when it's owner die and Saka needs to be feed. Mostly, Saka will haunt the next generation of the owner. 
 Question: What is Darma advised to take from work?
a week's break from work

Context: Previous studies have suggested a link between heart rate (HR) following trauma and the development of posttraumatic stress disorder (PTSD). This study expands on previous work by evaluating HR in burn patients followed longitudinally for symptoms of acute stress disorder (ASD) and PTSD. Data were collected from consecutive patients admitted to the Johns Hopkins Burn Center, Baltimore, Maryland, between 1997 and 2002. Patients completed the Stanford Acute Stress Reaction Questionnaire (n = 157) to assess symptoms of ASD. The Davidson Trauma Scale was completed at 1 (n = 145), 6 (n = 106), 12 (n = 94), and 24 (n = 66) months postdischarge to assess symptoms of PTSD. Heart rate in the ambulance, emergency room, and burn unit were obtained by retrospective medical chart review. Pearson correlations revealed a significant relationship between HR in the ambulance (r = 0.32, P = .016) and burn unit (r = 0.30, P = .001) and ASD scores at baseline. Heart rate in the ambulance was related to PTSD avoidance cluster scores at 1, 6, 12, and 24 months. In women, HR in the ambulance was correlated with PTSD scores at 6 (r = 0.65, P = .005) and 12 (r = 0.78, P = .005) months. When covariates (gender, -blockers, Brief Symptom Inventory Global Severity Index score) were included in multivariate linear regression analyses, ambulance HR was associated with ASD and PTSD scores at baseline and 1 month, and the interaction of ambulance HR and gender was associated with PTSD scores at 6 and 12 months. Multivariate logistic regression results were similar at baseline and 12 months, which included an HR association yet no interaction at 6 months and a marginal interaction at 1 month. While peritraumatic HR is most robustly associated with PTSD symptom severity, HR on admission to burn unit also predicts the development of ASD. Gender and avoidance symptoms appear particularly salient in this relationship, and these factors may aid in the identification of subgroups for which HR serves as a biomarker for PTSD. Future work may identify endophenotypic measures of increased risk for PTSD, targeting subgroups for early intervention. 
 Question: Symptoms of which disorder are evaluated with the Davidson Trauma Scale?

ptsd