Given an abstract, indicate which of the provided candidate titles (Option1 and Option2) best describes it (respond with the text of the title, not option1/2).

[EX Q]: Abstract: Double-lumen endobronchial tubes were placed "blindly" in 23 patients undergoing thoracotomy. Clinical criteria suggested satisfactory positioning in all cases; however, subsequent fibreoptic bronchoscopy revealed malposition in 48%. Bronchoscopic findings included the inability to view the bronchial cuff, narrowing of the bronchial lumen of the tube at the level of the cuff and herniation of the cuff over the carina. The potential hazards associated with these findings are discussed.
Which is the apt title for the abstract? option1: Placement of double-lumen endobronchial tubes. Correlation between clinical impressions and bronchoscopic findings. option2: Where's the spot?
[EX A]: Placement of double-lumen endobronchial tubes. Correlation between clinical impressions and bronchoscopic findings.

[EX Q]: Abstract: This case illustrates that massive tumor size, ulceration, or history of multiple recurrences are not absolute prerequisites for metastatic BCC. It supports the hypothesis that tumor proximity to major lymphatic systems or large-caliber blood vessels may be of significance. BCCs originating in skin overlying the parotid gland have the potential to penetrate to a rich vascular and lymphatic plexus as well as compromise the integrity of the facial nerve. Early treatment of these neoplasms utilizing accurate methods of microscopic control appears warranted to prevent the serious consequences of recurrences and deep tissue involvement.
Which is the apt title for the abstract? option1: Metastatic basal cell carcinoma originating in the supra-parotid region. option2: Relation between the frequency of colorectal adenoma and the serum cholesterol level.
[EX A]: Metastatic basal cell carcinoma originating in the supra-parotid region.

[EX Q]: Abstract: Since its first isolation, bovine beta-lactoglobulin (BLG) has been an enigma: although it is abundant in the whey fraction of milk, its function is still not clear. The results of the many physicochemical studies on the protein need a structural interpretation. We report here the structure of the orthorhombic crystal form of cow BLG at pH 7.6, at a resolution of 2.8 A. It has an unusual protein fold, composed of two slabs of antiparallel beta-sheet, which shows a remarkable similarity to plasma retinol-binding protein. A possible binding site for retinol in BLG has been identified by model-building. This suggests a role for BLG in vitamin A transport and we have discovered specific receptors for the BLG-retinol complex in the intestine of neonate calves.
Which is the apt title for the abstract? option1: The structure of beta-lactoglobulin and its similarity to plasma retinol-binding protein. option2: Tumor detection with phase-contrast imaging: an evaluation of clinical potential.
[EX A]:
The structure of beta-lactoglobulin and its similarity to plasma retinol-binding protein.