instruction:
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'.
question:
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.
answer:
4


question:
Question: Which amino acid serves as a starting point for the synthesis of porphyrins (heme group)? 
 Options:  <1> Valina <2> To the girl. <3> Asparagine <4> Lysine <5> Glycine
answer:
5


question:
Question: What are the three types of bone cells? 
 Options:  <1> Trabeculae, mitochondria and osteocytes. <2> Osteoclasts, trabeculae and osteoliths. <3> Osteocytes, osteoblasts and mitochondria. <4> Trabeculae, mitochondria and osteocytes. <5> Osteoblasts, osteoclasts and osteocytes.
answer:

5