This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Types of Genetic Disorders, Subject name: Pediatrics
[{'content': 'The test result of which investigation done, for a child with developmental delay is shown below? \nSelect and explain. \nA. Multiplex Ligation-dependent probe Amplification, B. DNA microarray, C. Fluorescent in situ hybridisation, D. Chromosomal painting', 'role': 'user'}, {'content': 'Answer: B \nExplanation: DNA microarray is used to identify thousands of different gene expressions at the same time- Recommended for unexplained intellectual disability. Fluorescent in situ hybridisation/Chromosomal painting- uses fluorescent probes for specific chromosome Multiplex Ligation-dependent probe Amplification- uses specific markers for specific region of chromosome', 'role': 'assistant'}]