Question: A 38-year-old man went to the emergency room for progressive dyspnea and dry cough of a week of evolution. He does not have a history of interest. The vital signs are: temperature 37.8ºC, blood pressure 110/70 mmHg, heart rate 105 bpm and respiratory rate 30 rpm. In the respiratory exploration, percussion dullness, diminution of tactile (vocal) thrill, and diminution of respiratory noises at the base of the right hemithorax stand out. The rest of the physical examination is normal. What is the most likely diagnosis? 
 Options:  <1> Pleural effusion <2> Lobar pneumonia <3> Acute bronchitis. <4> Pulmonary tuberculosis <5> Pneumothorax.
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