一篇发表在《Nature communication》杂志上，题为“Combined toll-like receptor 3/7/9 deficiency on host cells results in T-cell-dependent control of tumour growth”的文章，它的论文类型是什么？

The diagnosis of lung tumours with CT imaging methods is routinely used due to: A: a) the small difference in density between the lungs and the tumours B: b) the large contrast between low density, air-filled lung tissue and solid lung tumour masses C: c) the absence of other imaging modalities to diagnose tumours