In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.

Q: Question: In the respiratory chain: 
 Options:  <1> Ferrosulfurized proteins contain heme groups. <2> The heme groups are in carotenoids. <3> Cytochromes contain iron and sulfur groups. <4> Ubiquinones transport protons and electrons. <5> All transporters carry two electrons.

A: 4
****
Q: Question: Which of these statements is NOT a characteristic of phase I clinical trials? 
 Options:  <1> They usually have non-therapeutic goals. <2> They can be done in healthy volunteers. <3> They can be done in patients. <4> They are usually randomized. <5> They are usually open.

A: 4
****
Q: Question: A 14-year-old boy, 158 cm tall and weighing 76 kg, who came to our clinic for presenting for 4 months, without a previous traumatic event, mechanical pain in the right inguinal region, presented in the current clinical exploration, lameness with March with slight attitude in external rotation of said lower limb and limitation of hip flexion in neutral rotation. The diagnosis of suspicion will be: 
 Options:  <1> Fracture of the femoral neck. <2> Proximal femoral epiphysiolysis. <3> Perthes disease. <4> Still's disease <5> Transient synovitis of the hip.

A:
2
****