3. A patient was administered amoxicillin for an infection. After 2 days, the patient developed fever, lymphadenopathy, tachycardia, hypotension. He had no previous history of exposure to amoxicillin. His blood picture revealed haemolytic reaction with diffuse intravascular coagulation. The blood sample was positive for the presence of antibodies gainst amoxycillin. This type of autoimmune reaction is classified as