JSON FORMAT — family 'a'
Return only a valid JSON object (no code fences, no comments) that validates against this JSON Schema:
{"$schema":"https://json-schema.org/draft/2020-12/schema","title":"Assessment items (multiple choice, Bloom + IRT 3PL + CAT metadata)","description":"One multiple-choice assessment item per line, as generated by SIMA from a lecture transcript. The selected option is the correct answer; IRT parameters feed a computerized adaptive test.","type":"object","properties":{"header":{"type":"object","properties":{"m":{"type":"string"},"d":{"type":"string"},"l":{"type":"string"},"t":{"type":"string"},"bd":{"type":"array","items":{"type":"integer"}},"cat":{"type":"object","properties":{"theta_init":{"type":"number"},"theta_min":{"type":"number"},"theta_max":{"type":"number"},"se_stop":{"type":"number"},"max_items":{"type":"integer"},"exposure_ctrl":{"type":"string"}},"required":["theta_init","theta_min","theta_max","se_stop","max_items","exposure_ctrl"]},"k":{"type":"integer"}}},"items":{"type":"array","items":{"type":"object","properties":{"id":{"type":"string","description":"item identifier"},"bloom":{"type":"string","enum":["L1","L2","L3","L4","L5","L6"],"description":"Bloom level"},"topic":{"type":"string"},"statement":{"type":"string","description":"question stem"},"options":{"type":"array","items":{"type":"string"},"minItems":2,"maxItems":6},"correct":{"type":"integer","minimum":0,"description":"0-based index of the selected element of options"},"irt":{"type":"object","properties":{"a":{"type":"number","description":"discrimination"},"b":{"type":"number","description":"difficulty"},"c":{"type":"number","description":"guessing"}},"required":["a","b","c"]},"difficulty":{"type":"integer","minimum":1,"maximum":5},"cat":{"type":"object","properties":{"area":{"type":"string"},"exposure_cap":{"type":"number"},"demand":{"type":"string","enum":["low","medium","high"]}},"required":["area","exposure_cap","demand"]}},"required":["id","bloom","topic","statement","options","correct","irt","difficulty","cat"]}}},"required":["header","items"]}
Valid example:
{"header":{"m":"IRT3PL","d":"20260603","l":"es","t":"evaluación transversal","bd":[1,1,1,1,1,1],"cat":{"theta_init":0,"theta_min":-3,"theta_max":3,"se_stop":0.3,"max_items":1,"exposure_ctrl":"SH"},"k":4},"items":[{"id":"i1","bloom":"L1","topic":"Biología","statement":"¿Dónde ocurre principalmente la fotosíntesis?","options":["cloroplastos","núcleo","mitocondria","ribosoma"],"correct":0,"irt":{"a":0.9,"b":-1.0,"c":0.25},"difficulty":1,"cat":{"area":"biología","exposure_cap":0.2,"demand":"low"}}]}
