Which of the following is/are possible consequences or co-morbidities of Chronic Obstructive Pulmonary Disease (COPD)? W. Cor pulmonale X. Respiratory acidosis Y. Pulmonary hypertension Z. Lung cancer 1) only W, X and Y are correct 2) only W and Y are correct 3) only X and Z are correct 4) only Z is correct 5) all are correct