Which of the following statements is true?
a. it is necessary to have a nervous system to sense and respond to the environment.
b. all animals have a nervous system and it is necessary to have a nervous system to sense and respond to the environment, but not all animals sense and respond to the environment.
c. all animals have a nervous system, all animals sense and respond to the environment, and it is necessary to have a nervous system to sense and respond to the environment.
d. all animals have a nervous system.
e. all animals sense and respond to the environment.

A35-year-old woman arrives on the floor after an uneventful hysteroscopy to evaluate her long history of uterine fibroids. about 30 minutes after her arrival, she begins to complain of nausea and has two episodes of vomiting. the physical administers 0.625 mg of droperidol and 400 mg of acetaminophen by mouth. on follow-up evaluation, the patient's neck is involuntarily flexed to one side. she is alert, oriented, and conversation and has an otherwise normal neurological examination. which of the following is the most likely diagnosis? - cerebral vascular accident- conversion disorder- dystonic reaction to droperidol- munchausen syndrome- seizure