4341
Skin tests and in vitro lymphocyte stimulation revealed that the patient was sensitized to cephalothin and also to ampicillin .
 Chemical: cephalothin; Chemical: ampicillin
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: cephalothin; Chemical: ampicillin