This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'Bidextrous grasp appears at: \nSelect and explain. \nA. 3 months, B. 4 months, C. 5 months, D. 6 months', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 16 weeks - Tries to reach cube, but overshoots and misses. 20 weeks- Able to grasp voluntarily, Bidextrous approach 24 weeks- More mature grasp, Drops one cube when another is given. 28 weeks- Unidextrous approach, Bangs cube on table. Transfers. Retains one when another is given. Ref: Illingwoh\'s " The development of young child and infant" - page 278.', 'role': 'assistant'}]