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
Bidextrous grasp appears at: 
Select and explain. 
A. 3 months, B. 4 months, C. 5 months, D. 6 months
C: 5 months
Answer: C: 5 months 
Explanation: 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.