Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the symptoms of Mental retardation syndrome, Belgian type ?
    ### Response:
    What are the signs and symptoms of Mental retardation syndrome, Belgian type? The Human Phenotype Ontology provides the following list of signs and symptoms for Mental retardation syndrome, Belgian type. If the information is available, the table below includes how often the symptom is seen in people with this condition.
    