Xuedong Wang writes his PhD thesis on the topic Solidarity and the justifying collision of duties in criminal law. An investigation with special consideration of the collision of rescue duties of doctors using the example of the "triage problem" in the Covid-19 pandemic. The legal concept of the justifying collision of duties is not always uncontroversial, both at the dogmatic level and in practice. This concerns the problem of legitimization on the one hand and the boundary between the other grounds for justification, in particular the justifiable state of emergency, and the justifying conflict of duties on the other. In the context of the Covid-19 pandemic, the collision of rescue duties would not be uncommon in view of the scarcity of health resources, so the question must be raised as to how, on the one hand, doctors can be released from the dilemma situation in the legal system and, on the other hand, the consequences would not violate the difference in life value derived from constitutional law. Therefore, the doctrine of criminal law in relation to the justifying conflict of duties in a changing society must be reconsidered several times.