A 40 years old male with history of fall and one episode of vomiting near an alcohol shop. He was brought to casualty and he was awake with open eyes and had retrograde amnesia. Which of the following is most likely cause?

Ans.BConcussion: It is the most common type of traumatic brain injury.During head trauma, the head usually moves back and foh violently and there is a mismatch between the rapid deceleration and acceleration of the skull and the brain so that the brain hits repeatedly against the skull leading to concussion injury.Anterograde amnesia/Posttraumatic amnesia is a hallmark of concussion.In this type of amnesia, the events following the injury cannot be recalled.Headache, dizziness, nausea, vomiting like symptoms may present