<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 39-year-old woman is brought to the emergency room by her husband because of severe dyspnea and dizziness. Her symptoms started suddenly 30 minutes ago. She appears distressed. Arterial blood gas shows a pH of 7.51, pO2 of 100 mm Hg, and a pCO2 of 30 mm Hg. Which of the following is the most likely cause?? A: Panic attack, B: Opioid toxicity, C: Myasthenia gravis, D: Epiglottitis, E: Pulmonary fibrosis,  <response>: This is a question about a patient with acute onset severe dyspnea shortness of breath and dizziness. The arterial blood gas shows respiratory alkalosis with a high pH and low pCO2. This indicates the patient is hyperventilating. The choices given include panic attack, opioid toxicity, myasthenia gravis, epiglottitis and pulmonary fibrosis. Of these, panic attack is the most likely cause of acute onset hyperventilation leading to respiratory alkalosis. Opioid toxicity can cause hypoventilation and respiratory acidosis. Myasthenia gravis may cause dyspnea but not acute hyperventilation. Epiglottitis and pulmonary fibrosis do not cause acute hyperventilation.A: Panic attack 