You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Which among the following is the most common chromosomal anomaly encountered in spontaneously aboed foetuses? and explain in detail?
Among the spontaneously aboed foetuses, autosomal trisomies are the most common chromosomal caus. Within this category, trisomy 16 is the most frequent The recurrence risk of trisomy 16 is negligible in subsequent pregnancies