Consider the following premises. For all y_2, if y_2 were sad, then y_2 is a doctor. There is at least one y_2 for which if y_2 were a doctor, then y_2 is sad. For all y_2, if y_2 were a doctor, then y_2 is sad. Can we infer the following from them? If we can, name the inference rule being used: There is at least one y_2 for which if y_2 were a doctor, then y_2 is sad.
That is one of the premises. Therefore, the answer is yes.