In one study, researchers found that the stereotype of chronic obstructive pulmonary disease (chronic obstructive pneumonia) is so ingrained that women with this disease may not be diagnosed in time. The researchers asked 192 doctors to diagnose a batch Patients, who are men or women with long-term cough and a history of smoking. In the initial examination, only 49% of women were diagnosed with COPD, compared with 64.6% of men. A medical test report pointing to COPD was provided. At this time, the gender gap in the diagnosis rate narrowed, but it still did not completely disappear. The "stereotype" in the passage refers to. ['Women are less likely to have COPD.', 'Women with COPD are not easily diagnosed.', 'Men are more likely to have COPD.', 'COPD is easily diagnosed in men.']